Which of the following is an example of a homozygous dominant allele? wr Rr RR Rw
An example of a purebred dominant allele is RR.
What do you mean by Allele?An allele may be defined as one or two or more alternate forms of a gene.
An example of a purebred recessive allele is rr. While the allele Rr represents the heterozygous dominant condition.
Therefore, an example of a purebred dominant allele is RR.
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Arrange the symbols to form a DNA molecule.
What happens during the process of translation?
During the process of translation, the cell reads information from the messenger RNA and then uses this to form proteins.
What is translation?Translation is one of the many transformations that proteins have to undergo. In this process, the proteins read information from the messenger RNA codons, and from the information they get, they form proteins.
The chains that are formed during the process of translation result in polypeptide chains that form proteins.
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what are the steps to do a punnett square?(number and list the steps)
IN every energy transformation some blank is released
what is the groove of an enzyme that holds the substrate
in the pyramid of energy model, what does the 10% rule mean
The 10% rule refers to the amount of energy available to the next trophic level.
Hope this helps!what was the main environmental issue in this case?
A. Deforestation
B. Pollution
C. Overgrazing
D. Overpopulation
Answer:
Deforestation
Explanation:
The main environmental issue in this case is deforestation. Deforestation refers to the clearing, removal, or destruction of trees and vegetation from a forested area. This activity can have significant negative impacts on the environment.
How do the two types of endoplasmic reticulum differ?
PLEASE HELP!
Answer:
the other person is right
Explanation:
Which organelle is responsible for breaking down the cells that once made up the tail of a tadpole
which two type of cells are requiered during the process of osteogenesis?
HELP 15 MINUET TIME LIMIT1!!!!!
Mutations are avoided during replication because DNA polymerase is able to Blank Space __________.
repair itself
repair the DNA
encode a message
add more codes
DNA polymerase is an enzyme which carries out all forms of DNA replication. This enzyme catalyses the addition of nucleotide substrates to DNA in the 5' -3' direction during replication. Proof reading and error correction is done by the DNA polymerase. This enzyme can remove nucleotides from the end of the growing strand in order to correct mismatched bases.
Any factor that changes the shape of an enzyme can affect the enzyme's activity. Which of the following two factors affect an enzyme's operation the most
Which of the following is an example of an organism
The organism is defined as the individual form of life, which has the ability to carry out vital functions. The plants, animals, cells, and microorganisms are the organisms carrying out essential functions.
Organisms like fungi, animals, plants, microorganisms are considered as the biotic components, which carry out the vital functions necessary for survival and organisms.
The functions like growth, development, energy processing, response to the abiotic components, reproduction, and homeostasis are some of the vital functions that are required for the survival of organisms.
Thus, the organism is an individual form of life that carries out necessary functions.
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The Fugate family, also known as the "Blue People of Kentucky" have a condition known as methemoglobinemia which prevents hemoglobin from carrying oxygen and makes it difficult for unaffected hemoglobin to release oxygen to body tissues. These individuals had a blue complexion, but were otherwise healthy, with many living into their 80's or 90's. These individuals generally have methemoglobin levels of 10-20% of total hemoglobin. How does genetic drift account for the consistency of this level of methemoglobin?
The genetic drift account for the consistency of this level of methemoglobin as these individuals generally have methemoglobin levels of 10-20% of total hemoglobin.
What do you mean by Methemoglobin?Methemoglobin is a form of hemoglobin that has been oxidized, changing its heme iron configuration from the ferrous (Fe2+) to the ferric (Fe3+) state. Unlike normal hemoglobin, methemoglobin does not bind oxygen.
Methemoglobinemia can result from either congenital or acquired processes. Congenital forms of methemoglobinemia are due to autosomal recessive defects in the enzyme cytochrome b5 reductase.
Methemoglobin does not bind oxygen, thus effectively leading to a functional anemia. In addition, methemoglobin causes a leftward shift of the oxygen-hemoglobin dissociation curve.
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Final answer:
The consistency of methemoglobin levels in the Fugate family of Kentucky can be explained by genetic drift, a random process that can fix certain alleles in a small, isolated population.
Explanation:
The Fugate family of Kentucky, known for their blue skin due to methemoglobinemia, presents a case where genetic drift could explain the high consistency of methemoglobin levels.
Methemoglobinemia occurs when hemoglobin, which should normally be in the ferrous (Fe²⁺) form, is oxidized to the ferric (Fe³⁺) form, limiting its capacity to carry oxygen.
In the Fugates' isolated population, certain genetic variants, including those affecting methemoglobin levels, could have increased in frequency through genetic drift. This is a random process where allele frequencies within a small population change due to chance events.
Thus, a homogenous environment where the allele for methemoglobinemia is present and no significant selective advantage or disadvantage is attached to it could lead to stable levels of methemoglobin across the population due to genetic drift.
This process is distinct from balancing selection, such as the situation with the sickle cell trait where heterozygotes have a selective advantage in malaria-endemic regions, showing the complexity of genetic inheritance and its interaction with the environment.
Unlike sickle cell trait, no apparent selective advantage is associated with higher levels of methemoglobin, but the closed nature of the gene pool in the Fugate family likely led to the perpetuation and stability of these levels through genetic drift.
how is usable nitrogen obtained by anumals?
Answer:
The animals get nitrogen from the plants. The nitrogen that is present in the environment is not used by the plants in the gaseous form. The bacteria that is found in the soil fixes nitrogen and makes it usable for the plants.
The plants uptake nitrpogen in the form of nitrates. The animals that feed on these plants uptake nitriogen from it.
The animals excrete the waste materials and release nitrogen in the environment.
Which of the following summarizes the role of the hypothalamus?
A. It connects the endocrine and nervous systems and controls the pituitary gland.
B. It controls the rate at which cells burn fuels from food to produce energy.
C. It produces glucagon and insulin to control glucose levels in the blood.
D.It releases adrenaline as a response to fear, stress, and excitement.
The hypothalamus is accountable for monitoring some of the metabolic procedures and other activities of the autonomic nervous system. It discharges and produces some of the neurohormones, known as releasing hormones or hypothalamic hormones, and these in return inhibit or stimulate the secretion of pituitary hormones.
Thus, the correct answer is option A, that is, hypothalamus connects the endocrine and nervous systems and controls the pituitary gland.
Bobby ate a granola bar and then went for a run. He ran for one mile and sweat heavily while listening to music on his iPod. Bobby's body transformed chemical energy from the granola bar into
F. Electrical and Sound Energy
G. Electrical and Heat Energy
H. Mechanical and Heat Energy
J. Mechanical and Light Energy
what is a archeah whoever answers rights gets 20pts
what is the source of energy in most ecosystems
The primary source of energy in most ecosystems is the sunlight. Photoautotrophs like plants capture this solar energy through photosynthesis, converting it into chemical energy (ATP) used for forming complex organic molecules. This energy is then transferred through ecosystems as these organisms are consumed.
Explanation:The primary source of energy in most ecosystems is the sunlight. Organisms known as photoautotrophs, such as plants, algae, and photosynthetic bacteria, capture this energy through the process of photosynthesis. They convert solar energy to chemical energy in the form of ATP, which is used to synthesize complex organic molecules like glucose. This energy is then transferred through ecosystems as other organisms consume these photoautotrophs and use the stored energy for their metabolic activities. This process forms the basis of most food webs, making sunlight an essential energy source for life on Earth.
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Question:What is the source of energy in most ecosystems?
Animals
Plants
Oxygen
Sunlight
A snapping turtle has 52 chromosomes which statement correctly compares the number of chromosomes in a body so with that in a sex cell of a snapping turtle
Answer:
The question lacks options, the options are:
A). the body cell has 2n; the sex cell has 1n.
B). the body cell has 26; the sex cell has two.
C). the body cell has 1n; the sex cell has 2n.
D). the body cell has 24; the sex cell has 26
The answer is A
Explanation:
According to the question, the snapping turtle possesses 52 chromosomes in its cell. This means that the chromosomal number of its body cell is 52. However, the turtle, which reproduces sexually will produce gametes or sex cells via meiosis. Meiosis is the kind of cell division that results in daughter cells (gametes) that have a reduced number of chromosomes (by half).
Based on this, the diploid cells (2n) of the turtle with chromosome number 52 will undergo meiotic division to produce haploid gametes or sex cells (n) with chromosome number 26.
N.B: Diploid (2n) means two complete sets of chromosomes while haploid (1n) means one complete set of chromosome.
The body cell of the turtle contains two set of chromosomes received from each parent, hence, making it Diploid (2n). However, meiosis will reduce the chromosome number to one set in each gamete i.e. haploid (n).
Describe how an organism has 2 sets of dna and the importance of homologous chromosomes
refer to the map of the earths lithosphereic plates.
at which of these convergent plate boundaries are active volcanoes not likely to be located?
a. Nazca plate and South American plate
b. Juan de Fuca plate and North American plate
c. Arabian plate and Eurasian plate
d. Indian-Australian plate and Eurasian plate
C
Arabian plate and Eurasian plate
When you climb a rope you change blank energy into blank energy
In order to recreate the process of energy production that takes place in the Sun, scientists use
hydrogen gas and add heat and pressure.
helium gas and remove heat and pressure.
hydrogen gas, add heat, and remove pressure.
helium gas, remove heat, and add pressure.
Answer: Hydrogen Gas, heat and pressure.
Explanation: Sun is made up of hydrogen and helium gas, heat and high pressure. Sun is huge ball made up of 70 per cent of hydrogen and 28 per cent. The pressure in the sun is also high.
The sun shines because it turns hydrogen into helium by the process of nuclear fusion. This states that with time the amount of helium will be more and hydrogen will be less.
The correct answer is hydrogen gas, add heat, and remove pressure.
Explanation:
The correct answer is hydrogen gas, add heat, and remove pressure. In the Sun, energy is generated through a process called nuclear fusion, where hydrogen atoms combine to form helium atoms. Scientists try to recreate this process by using hydrogen gas and adding heat to initiate the fusion reaction. Removing pressure helps to create the conditions required for the fusion reaction to occur.
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A molecule that can be used as a molecular clock has a neutral mutation rate of one mutation per 20 million years. How many years ago did two species share a common ancestor if the molecules found in these two species differ by a total of six mutations?
Answer:
60 million years ago
Explanation:
The formula needed for this problem to calculate the correct number of years is:
Number of Base Pair Mutations × (Number of Years ÷ Mutation Rate) = Years of Evolution
Just like in math, simply substitute the corresponding numbers to get the desired answer:
6 Base Pair Mutations × (20,000,000 Years ÷ 1 Mutation) = 120,000,000 Years of Evolution
Then, divide the amount of time that separates these two species in half to determine how long ago their lineages shared a common ancestor. The formula needed for this part is:
Total Years of Evolution ÷ Number of Species (Lineages) = Years of Evolution From a Common Ancestor
Again, substitute the correct numbers in their place to get the answer:
120,000,000 Years of Evolution ÷ 2 Species/Lineages = 60,000,000 Years of Evolution From a Common Ancestor
Hope this helps :)
Final answer:
Two species that have molecules differing by six neutral mutations, given a mutation rate of one mutation per 20 million years, diverged from a common ancestor approximately 120 million years ago.
Explanation:
The question asks how long ago two species share a common ancestor if their molecules differ by six mutations, with the molecular clock indicating one mutation every 20 million years. To calculate the time of divergence, we multiply the number of mutations by the mutation rate. Since there are six mutations observed, and each mutation represents 20 million years of divergence, we perform the calculation of 6 mutations × 20 million years/mutation.
The calculation reveals that the two species diverged from a common ancestor 120 million years ago (6 × 20 million years = 120 million years). This period is based on the assumption that mutations as tracked by the molecular clock occur at a constant rate.
Which of these BEST describes our current understanding about how species evolve over time?
A) As organisms use certain traits more frequently, each organism evolves over time.
B) Populations of organisms evolve rapidly due to genetic changes brought about by random mating patterns.
C) Traits that result in a greater number of mutations occur more frequently, causing the population to evolve.
D) Populations evolve as natural selection results in a change in the frequency of alleles within the population over time.
Some "cleaner fish" consume parasites and mucus from the skin of larger fish. What would be a reasonable argument for why this could be a mutualism rather than a commensal relationship?
Answer:
The cleaner fish reduce the number of parasites on the larger fish.
Explanation:
What are two ways in which fungi reproduce
Fungi reproduce both asexually through methods like budding and producing spores, and sexually by spore fusion forming a zygospore.
Asexual reproduction may occur through several methods, including budding, fragmentation of hyphae, and the production of asexual spores. Sexual reproduction involves the fusion of spores from two parental fungi to form a zygospore, leading to increased genetic diversity.
For instance, yeast, which is a type of fungi, commonly reproduces asexually by budding. In contrast, during sexual reproduction, spores fromtwo-parentt fungi combine to create a new organism with a mix of genetic material from both parents. This is evident in forms such as zygospores (from the former Zygomycota), ascospores (in Ascomycota), and basidiospores (in Basidiomycota).
Fungi's ability to reproduce in both ways allows them to adapt to environmental conditions. Quick asexual reproduction can occur when conditions are stable, while sexual reproduction can increase genetic variation when conditions are changing and such variation may be advantageous for survival.
You have an simple of an unknown mineral. It can scratch fluorite but not quartz. What is it’s approximate hardness?
The approximate hardness of an unknown mineral ranges from 5-6 on the Mohs hardness scale.
How will you determine the hardness of any mineral or element?The hardness of any mineral or element is estimated by the usage of the Mohs hardness scale or by scratching the unknown element with known substances.
The hardness of fluorite is four on the Mohs scale, while the hardness of quartz is seven which is harder as compared to fluorite.
If an unknown mineral makes a scratch on fluorite but not on the quartz, its hardness will definitely be higher than fluorite but lower than quartz.
Therefore, the approximate hardness of an unknown mineral ranges from 5-6 on the Mohs hardness scale.
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