Answer:
a.
external fertilization
in a population of 900 pea plants, 530 are homozygous purple, 250 are heterozygous purple, and 120 are homozygous white. Purple (P) is dominant and white color (p) is recessive. determine the genotypic frequency in the population for PP, Pp, and pp individuals.
The genotypic frequencies for PP, Pp, and pp in the specified pea plant population are 58.8%, 27.7%, and 13.3% respectively. These frequencies can be used to study the genetic structure of the population and predict the distribution of phenotypes in future generations.
Explanation:The genotypic frequency in a population is determined by the number of individuals with a specific genotype in comparison to the total number of individuals. In this case, we are looking at the frequencies of
PP
,
Pp
, and
pp
pea plants. Genotypic frequency is calculated as the number of individuals with a specific genotype divided by the total number of individuals.
For the homozygous dominant (PP) : 530/900 = 0.588 or 58.8% are homozygous dominant.
For the heterozygous (Pp): 250/900 = 0.277 or 27.7% are heterozygous.
For the homozygous recessive (pp): 120/900 = 0.133 or 13.3% are homozygous recessive.
By summing up these frequencies, we should get 1 (or 100%), confirming that we have accounted for all the pea plants in the population. The data will help to understand the genetic structure of the population and can be used to predict future generations' genotypic frequencies, providing insight into the distribution of phenotypes.
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Final answer:
The genotypic frequencies for PP, Pp, and pp in a population of 900 pea plants are approximately 58.89%, 27.78%, and 13.33%, respectively.
Explanation:
To determine the genotypic frequency in the population of pea plants for PP, Pp, and pp individuals, one must divide the number of individuals with each genotype by the total population size. In this population of 900 pea plants, we are given that 530 are homozygous purple (PP), 250 are heterozygous purple (Pp), and 120 are homozygous white (pp).
For PP: The genotypic frequency is 530 / 900 = 0.5889 (or about 58.89%).For Pp: The genotypic frequency is 250 / 900 = 0.2778 (or about 27.78%).For pp: The genotypic frequency is 120 / 900 = 0.1333 (or about 13.33%).These frequencies are important to know as they provide insights into the genetic structure of the population and can predict phenotypic ratios for future generations if the population is closed and Mendelian inheritance applies.
A typical human cell contains 46 chromosomes. After mitosis and cell division, each of the two new cells formed for the original cell:
A. gets 23 new chromosomes
B. a grows new chromosomes from
existing DNA
C. gets a complete set of 46 chromosomes
Answer:
gets 23 new chromosomes
What do paleontologists use to define the boundaries between geologic time intervals?
Answer:
Explanation:
The geologic time scale (GTS) is a system of chronological dating that relates geological strata (stratigraphy) to time. It is used by geologists, paleontologists, and other Earth scientists to describe the timing and relationships of events that have occurred during Earth's history.
What are the main reasons forests are cut down?
Answer:
to make things
Explanation:
They use them to make papers, build houses, people use them to make fire, etc.
Answer:
agriculture
logging
urban development
Explanation:
i got right
What annotations help how can survive a hurricane?
(use your own words)
The endocrine gland called the ____________________ gland communicates with the hypothalamus to control many body activities. a. cortex c. pituitary b. pancreas d. hippocampus
Answer:
pituitary
Explanation:
The hypothalamus works with the pituitary gland, which makes and sends other important hormones around the body. Together, the hypothalamus and pituitary gland control many of the glands that produce hormones of the body, called the endocrine system.
What is the best definition of an allele?
Answer:
An allele is one of a pair of genes that appear in a particular location on a particular chromosome and control the same characteristic, such as blood type or color blindness.
Explanation:
Answer:
One of alternative forms of the same gene
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Many nonscience careers require a knowledge of science because workers must
O
A. develop new scientific laws and theories.
O
O
B. use materials and processes that follow scientific principles.
O
O
C. use the process of scientific inquiry.
O
D. keep up with new developments in science.
Answer:
D
Explanation:
Advancements in the science field often have an impact on other careers
During the warm temperatures of summer the arctic fox produces enzymes that cause it's for to become reddish brown. During the cold temperatures of winter, these enzymes do not work. As a result, the fox has a white coat that blends into the snow with the background
Answer:
The expression of certain genes is affected by temperature
Explanation:
During the warm temperatures of summer the arctic fox produces enzymes that cause it's for to become reddish brown. During the cold temperatures of winter, these enzymes do not work. As a result, the fox has a white coat that blends into the snow with the background
The expression of certain genes is affected by temperature explains this change in color found in them to match the surrounding snow, this is the reason why during the spring and summer, it has a dark coat which help match the brown dirt in it environment
Answer:
4. The expression of certain genes is affected my temperature
Explanation:
Lol I just did this question on my test
In the sierra nevada mountains of california there are many populations of the checkerspot butterfly, euphydryas editha. you notice that females of one population (population
a.lay their eggs near the tip of a plant's stem. females of another population in the same area (population
b.lay their eggs at the base of the stem on a different type of plant. the young hatch out as caterpillars; they live on the host plant and eat its leaves.
Answer: partitioning of the butterfly due to available resources leading to a reduction in population in a particular location.
Explanation:
What happen here is a reduction in population due to a reduced sharing of resources.
Two species of an Organism can not successfully occupy a space due to competition for available resources.
Here, the one population of checker spot is near the stem tip while the other population of checker spot butterfly is at the base of the stem to avoid competition for available resources and space. Hence, they live separately in the different position on the stem.
The main function of the male reproductive system is to produce and transport. True or False
Answer:
True
Explanation:
The purpose of the organs of the male reproductive system is to perform the following functions: To produce, maintain, and transport sperm (the male reproductive cells) and protective fluid (semen) To discharge sperm within the female reproductive tract during sex.---Quoted from WebMD
Describe ergogenic aids and the risks that are associated with using them.
Answer:Common ergogenic aids include anabolic steroids, which increase muscle mass. These illegal supplements are associated with a number of serious adverse effects, some irreversible. Creatine modestly improves athletic performance and appears to be relatively safe
Explanation:
The effect of ergogenic :Medical Definition of ergogenic
: increasing capacity for bodily or mental labor especially by eliminating fatigue symptoms an ergogenic drug.
Final answer:
Ergogenic aids are substances that improve energy production or recovery, but they carry serious health risks and ethical concerns. Anabolic steroids and hormones like erythropoietin and human growth hormone are banned by major athletic organizations due to the dangers they pose and the unfair advantage they provide. Their use can lead to irreversible side effects, including heart disease, infertility, and aggressive behavior.
Explanation:
Ergogenic aids are substances or devices that enhance energy production, use or recovery and provide athletes with a competitive advantage. Among the most recognized ergogenic aids are anabolic steroids, which are synthetic variations of the male sex hormone testosterone. While anabolic steroids can build muscle mass and improve athletic performance, their use is associated with severe and sometimes irreversible health risks.
Other common performance-enhancing hormones include erythropoietin, which boosts red blood cell production, and human growth hormone, which can aid in muscle building. The use of these substances raises significant ethical concerns as they offer an unfair advantage over competitors and are considered a form of cheating. Furthermore, ergogenic aids can cause serious, nonreversible side effects that can be fatal, such as increasing the risk of heart attacks, infertility, and aggressive behavior, commonly referred to as "roid-rage".
All major athletic organizations, including the International Olympic Committee, National Collegiate Athletic Association, Major League Baseball, and National Football League, have banned the use of performance-enhancing drugs due to the health risks and the unfair competitive advantage they provide.
What would be a likely outcome to the nitrogen cycle, if the population of nitrifying bacterial severely decreased?
An increase in the production of nitrites would occur
An increase in production of nitrates would be formed
An increase in the amount of ammonium present in the soil
An increase in the population size of denitrifying bacteria
If the population of nitrifying bacteria severely decreased, there would likely be an increase in the amount of ammonium present in the soil. Therefore, option (C) is correct.
What is nitrogen cycle?The nitrogen cycle is the process by which nitrogen is converted into different chemical forms as it circulates through ecosystems. Nitrifying bacteria change ammonium (NH4+) into nitrite (NO2-) and then into nitrate (NO3-), which plants can use to make DNA and amino acids, which are important biomolecules.
If there were less nitrifying bacteria, it would take longer for ammonium to turn into nitrite and nitrate. This would cause ammonium to build up in the soil. This could make plants and other living things sick, and if the extra ammonium gets into nearby bodies of water, it could change the way aquatic ecosystems work. Nitrifying bacteria would not cause more nitrites or nitrates to be made if they were killed off in large numbers, because these compounds are the end result of the nitrification process. Lastly, the number of denitrifying bacteria may grow, but this would not be a direct result of the number of nitrifying bacteria going down.
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Lupus, a condition in which the body attacks its own cells, is an example of
Answer:
Lupus is an example of an autoimmune disease.
Explanation:
The outer most layer of the interior
Which activity is a function of blood?
Answer:
blood carries oxygen to difreent parts of the body
Explanation:this is why you have a heart so you can pump oygenated blood throughouut your body hope this helps god bless
Answer:
deliver oxygen and nutrients to and remove wastes from body cells.
Explanation:
Jamie is reviewing a new diet plan that involves purchasing pre-packaged meals and taking a patented energy supplement. In an ad explaining how it works, Jamie reads about a study cited as evidence supporting the effectiveness of the plan. In the study, two groups were followed: one following the plan and another following a simple low-carbohydrate diet. What should Jamie look for in the study to have full confidence in its scientific reliability?
Answer:
Jamie should look at the difference in results in the two groups of people.
Explanation:
According to the question, two groups are being studied in which the one group is taking the food according to the new diet plan and the other group is taking a simple low-carbohydrate diet. So, for having full confidence in its scientific reliability, Jamie should look that the people taking pre-packaged meals as per the new diet plan are getting better results or not than the people who are taking low carbohydrate diet. If she gets a result in which it is found that new diet plan is giving a positive health benefit to the people then this new plan is scientifically reliable.
Answer:
C. Details on the number of studies conducted and the results of each trial!
Explanation:
i got it right on the test
Farmers may use windmills for electricity and pumping water.
True
False
Answer:
THE ANSWER IS TRUE
Explanation:
: )
how did receptors in the nose and on the tongue help our ancient ancestors survive?
Answer:Our ancestors’ perception of taste was important for survival and thriving. Now researchers are trying to produce food with reduced calories or salt that remains palatable
Explanation:
Evolution of taste
Our ancestors had to seek out their food from the environment, and their perception of taste was important for survival and thriving. ... They work with foods that are being produced in a manner that reduces calories or salt or adds ingredients with potential health benefits from plants
Answer:
Helped them find food that would provide energy and nutrients.
Explanation:
Our ancestors had to find their food from the environment, and their perception of taste was important for survival and thriving. The sense of smell plays a decisive role in human societies, as it is linked to our taste for food, as well as our identification of pleasant and unpleasant substances.We have around 4 million smell cells in our noses, divided into about 400 different types. There is a large genetic variability within and between populations for our ability to detect odours. Each smell cell carries just one type of receptor for us to understand.
While many factors affected there choice of food and how we perceive its taste. When food meets our taste senses, raised bumps on our tongue called the papillae react. the ability to assess the calorie intake and the nutrient value of the food, helped them detect dangerous or poisonous foods (which would tend to be bitter or sour). It also helped distinguish foods that appeared in new environments.
What is not a function of the kidneys?
Answer:
The functions of the kidneys are:
Regulate water, inorganic ion, and acid-base balance.Remove metabolic waste products from the blood and excrete them in the urine.Remove foreign chemicals from the blood and excrete them in the urine.Perform gluconeogenesis.Secrete hormones.The kidneys filter blood, remove waste, maintain blood pressure, balance electrolytes, and stimulate red blood cell production but do not produce non-renal hormones like insulin.
The main functions of the kidneys are to filter the blood, remove wastes, and regulate vital substances in the body. The kidneys work to maintain blood pressure, balance electrolytes, and stimulate the production of red blood cells through the secretion of erythropoietin. However, what is not a function of the kidneys is the production of hormones that control non-renal functions such as insulin, which regulates glucose levels in the body.
Some diseases can impact the kidney's ability to perform these functions effectively, leading to the need for medical interventions like dialysis. Dialysis is a procedure that mimics the kidneys' filtering function when they are no longer capable of doing this sufficiently on their own.
Use what you have read to summarize Jackie Robinson’s story in two or three sentences.
Answer: Branch Rickey was searching for the right man to become the first African American player in Major League Baseball. Rickey explained the challenges to player Jackie Robinson. He would face racism and require a unique type of courage to succeed, but if he did succeed, he could make the box score the only thing that mattered.
Explanation: It's the sample response
Jackie Robinson was key in desegregating professional sports in the U.S., being the first African American to play in the National League. He also played an active role in the civil rights movement and contributed towards supporting African-American businesses.
Explanation:Jackie Robinson was an influential figure in the history of desegregation in the United States, particularly in professional sports. On April 15, 1947, Robinson started for the Brooklyn Dodgers, becoming the first African American to break the color barrier in the National League. Beyond his baseball career, he was an active participant in the civil rights movement, served on the board of directors for the NAACP, and assisted in the foundation of an African American-owned bank.
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The layer of blood vessels innervated by sympathetic vasomotor fibers is called the
Answer:
Tunica Media I hope this helps
Explanation:
Do turtles fly?...................................
Answer:
They fly in the water
Explanation:
Flexibility is _________.
a. best described as the ability to move without pain during strenuous exercise.
b. the ability of joints to move through their full range of motion.
c. sustained motion without resistance.
d. the ability to move rapidly during exercise.
Answer:
b
Explanation:
to become more flexible, you have to stretch your muscles. This allows your joints to move more freely by loosening what is keeping them tight.
Flexibility in physical fitness refers to the ability of joints to move through their full range of motion. It doesn't have to do with the speed or endurance during exercise, rather it concerns the joints' and muscle's allowance of movement into various positions without discomfort.
Explanation:In physical fitness, flexibility is most accurately defined as the ability of joints to move through their full range of motion. This means that when we say someone is flexible, they are capable of bending, twisting, and stretching their bodies into different positions without discomfort. Moreover, being flexible isn't necessarily connected to the ability to move rapidly during exercise—this is more related to agility. Also, while staying in motion without resistance pertains to endurance, flexibility specifically centers on the joints. Instead, a flexible person can perform activities such as touching their toes or doing a split because their joints and muscles allow for these movements.
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The major role of absorption in the ileum is to reclaim bile salts to be recycled back to the liver. True or False
Answer:
The correct answer is "True".
Explanation:
It is true that the major role of absorption in the ileum is to reclaim bile salts to be recycled back to the liver. The ileum is the final part of the small intestine, serving as the terminator of the ileocecal sphincter. The ileum is the final step of absorption in the small intestine and while most nutrients are absorbed in the jejunum, the ileum absorbs the bile salts and some vitamins, like vitamin B12.
Police discover a badly decomposed body buried in an area where a man disappeared some years before. the case was never solved, nor was the victim´s body ever recovered. as the lead investigator, you suspect that the newly discovered body is that of the victim. what is your main challenge in using dna typing to determine whether your suspicion is correct? how would you go about using dna technology to test your theory? explain, please.
Final answer:
The main challenge in using DNA typing to determine whether the newly discovered body is that of the victim is the state of decomposition. To test the theory, the lead investigator can collect DNA samples from the remains and send them to a forensic laboratory for analysis.
Explanation:
The main challenge in using DNA typing to determine whether the newly discovered body is that of the victim is the state of decomposition. If the body is badly decomposed, it can affect the quality of the DNA and make it more difficult to obtain a usable sample. Additionally, if the body has been buried for several years, the DNA may have degraded to a point where it is no longer viable for analysis.
To test the theory, the lead investigator can begin by collecting DNA samples from the remains. This can be done through bone or teeth samples, as well as any soft tissue that may still be present. Once the samples are collected, they can be sent to a forensic laboratory for DNA analysis.
The DNA analysis process involves extracting the DNA from the samples, amplifying specific regions of the DNA using polymerase chain reaction (PCR), and comparing the amplified DNA to known reference samples. If the DNA from the remains matches the DNA from the reference samples, it would provide strong evidence that the newly discovered body is that of the victim.
To test the theory, forensic experts would extract DNA from the remains and attempt to amplify it using Polymerase Chain Reaction (PCR).
The main challenge in using DNA typing to confirm the suspicion lies in the state of decomposition of the body. Decomposition can degrade DNA, making it difficult to obtain viable samples for analysis.
However, if any DNA remains intact, comparison with reference samples, such as those from the victim's family or personal effects, can provide crucial evidence.
Next, they would compare the obtained DNA profile with reference samples, looking for matches in specific regions of the genome. If a match is found, it would strongly support the hypothesis that the newly discovered body is indeed that of the missing person.
Additionally, advanced techniques like mitochondrial DNA analysis could be employed to overcome challenges posed by degraded DNA.
Mid-ocean ridges, such as the mid-Atlantic ridge, normally form when tectonic plates are:
1) converging
2) diverging
3) stationary
4) sliding past each other
Answer:
2) diverging
Explanation:
Mid-ocean ridges occur along divergent plate boundaries, where new ocean floor is created as the Earth's tectonic plates spread apart. As the plates separate, molten rock rises to the seafloor, producing enormous volcanic eruptions of basalt.
Climate change may cause the populations of some species to increase and expand their range of distribution. Explain why this change can be positive for the species but negative for the ecosystems it invades.
Answer:
Here’s one possible answer:
An increase in the population of a species increases the chances of survival for that species. The species will be able to survive severe changes such as diseases and disasters. However, if the species moves into a new area, competition will increase for the species already in that area. The increased competition will negatively affect these other species.
Explanation:
Kevin decides to find out which fertilizer is best for tomatoes. He set up three plants, giving one no fertilizer, giving the second type A fertilizer, and giving the third type B fertilizer. He kept the first plant inside in a large pot, and the other two he planted in the yard. Is Kevin's experiment designed correctly? Group of answer choices No, it has too many variables or possible changes. It is impossible to say without knowing more information. Yes, it has controls and variables. No, we haven't seen the results yet
Answer:
No, it has too many variables or possible changes.
Explanation:
If you carried out an experiment or research on something, you have to given the same environmental and soil conditions to the factors. In this experiment, Kevin put the first plant in large pot and the other two plants in the field conditions. For performing correct experiments, Kevin put all the plants in separate pots or in the field conditions.
Some compounds are not active carcinogens until they are converted into cancer-causing compounds in the body. To identify potential carcinogens using the Ames test, how should a compound be treated before being tested on bacteria?