some heterozygous alleles create variations in expression so that there is not a clear dominant or recessive allele true or false ?
Answer: False
The variations in expression depends on how genes code for proteins that would specify whether it will be dominant or recessive allele. Within a population, there may be a number of alleles for a given gene and these differences can cause variations in the protein that is produced. The change in protein expression affect traits due to the variations in protein activity or expression that produce different phenotypes.
Moreover, individuals that have copies of different alleles are known as heterozygous and individuals that have two copies of the same allele are referred to a homozygous. The expression patterns observed in inheritance will depend on whether the allele is found on an autosomal chromosome or a sex chromosome, and on whether the allele is dominant or recessive.
In which phase does crossing over occur (where the homologous pairs exchange genetic information)?
Prophase I
Prophase II
Prophase III
Answer:
Prophase l is correct If ya have Usa Test prep
Some steps in cell division are shown below: 1. Chromosomes condense and pair up 2. Segments of DNA of sister chromatids twist and cross 3. Exchange of DNA occurs between chromosomes 4. Haploid chromosomes condense Which of the following steps is least likely to occur during meiosis 1?
Sorry I'm late :P But if you still were interested in the answer, it's Step 4. Got it right on the test.
Steps in the cell division that occurs during meiosis 1 are :
Chromosome condense and pair upSegments of DNA sister chromatids twist and crossExchange of DNA occurs between homologue chromosomeThe process that is least likely to occur during meiosis 1 is :
Haploid chromosome condensation - because this occurs during meiosis 2.Meiosis It is a process during which exchange of genetic material between the homologue chromosome and such division yield four haploid cells.The diagrammatic representation of meiosis is shown below :To know more about meiosis :
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which of the following best describes protists?
A)They are a diverse group of eukaryotes that include several unrelated lineages.
B)They are a diverse group eukaryotes with a single common ancestor.
C)They are a diverse group of prokaryotes that includes several unrelated lineages.
D)They are diverse group of prokaryotes with a single common ancestor
They are a diverse group of eukaryotes that include several unrelated lineages.
What are protists?Protists are unicellular, eukaryotic, and microscopic organisms.
They have some characteristics of both plants and animals.
Examples are amoeba, euglena, plasmodium, etc.
They can be parasites.
They live in moist areas and water.
Thus, the correct option is A)They are a diverse group of eukaryotes that include many unrelated lineages.
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Scientists have changed the DNA of a type of cabbage so that it contains a tiny amount of poison from a scorpion’s tail. The poison in the cabbage kills caterpillars that try to eat it. This is an example of
A) gene therapy.
B) selective breeding.
C) genetic engineering.
D) artificial selection.
this awnser is c)genetic engineerig
which symbol represents a hybrid
A Aa
B BB
C De
D cc
ANSWER FASSSSSSSTTT PLEASE
In genotypic terms, a hybrid organism is represented by a combination of both dominant (A) and recessive (a) alleles. Therefore, the option A. Aa symbolizes a hybrid organism.
Explanation:In genetics, a hybrid organism is one that possesses a mix of characteristics. This is usually indicated by a combination of both dominant and recessive alleles in its genotype. So, symbolically, the option that represents a hybrid is A. Aa.
This pattern signifies a pair of alleles, where 'A' is dominant and 'a' is recessive. This results in a heterozygous genotype and is characteristic of hybrid organisms. Other options such as 'BB' and 'cc' represent homozygous genotypes and 'De' is not standard notation in genetics.
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Which of these is not an environmental effect of farming?
increased air temperatures
habitat loss
soil erosion
poisoned wildlife from pesticides
what is the function of an inhibitor in an enzyme substrate reaction?
a. activate the substrate
b. deactivating the product
c. activating an enzyme
d. deactivating an enzyme
Answer:
c deactivating an enzyme
An inhibitor deactivates an enzyme in an enzyme-substrate reaction by binding to the active site or an allosteric site, preventing the substrate from binding and reducing the enzyme's activity. So the correct option is d.
Explanation:The function of an inhibitor in an enzyme-substrate reaction is to interfere with the enzyme's activity. This can be achieved by different types of inhibitors through various mechanisms. An inhibitor may bind competitively to the active site of an enzyme, preventing the substrate from binding, in what is known as competitive inhibition. Alternatively, an inhibitor can bind noncompetitively to an allosteric site on the enzyme leading to a change in the enzyme's conformation and thus reducing its affinity for the substrate; this type of inhibition is called allosteric inhibition. The correct answer to the question would be (d) deactivating an enzyme, as inhibitors generally work by reducing or stopping the catalytic activity of enzymes.
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Which describes a disadvantage of social behavior?
Final answer:
A disadvantage of social behavior is social loafing, where individuals contribute less in a group setting, leading to reduced group productivity. Additionally, technological influences on social behavior can risk social isolation and autonomic nervous system disorders.
Explanation:
One disadvantage of social behavior is the phenomenon of social loafing. Social loafing occurs when individuals in a group contribute less effort to a task than they would if they were working alone. This tendency leads to diminished productivity and output within the group, as some members might rely on others to pick up their slack. This behavior can negatively impact group dynamics and overall performance, making many individuals dread group work, particularly when tasks require equal participation from all members.
Moreover, social behaviors influenced by technology might contribute to social isolation, reducing face-to-face interactions and potentially leading to loneliness and depression. As individuals become more reliant on electronic means of communication and social media, there is a heightened risk of disorders related to the autonomic nervous system, which includes deficits in social engagement and the capacity for love.
PUNNETT SQUARES: QUESTION 5 Tay-Sachs disease is caused by a recessive lethal allele, meaning that individuals that are homozygous recessive (tt) will have the disease and die before they are able to have offspring. Two parents that are heterozygous (T) carriers for Tay-Sachs want to have children. What are the chances that their children will get Tay-Sachs disease?
Why does fern reproduction require two generations?
Final answer:
Fern reproduction requires two generations due to the alternation of generations in its life cycle, with a dominant sporophyte stage producing spores and a less visible gametophyte stage for sexual reproduction. This cycle ensures genetic diversity and adaptation to different environments.
Explanation:
Fern reproduction requires two generations due to its life cycle involving alternation of generations, which includes both sporophyte and gametophyte stages. The sporophyte generation is the more visible phase in ferns, characterized by leafy fronds with undersides dotted with clusters of sporangia, which produce spores. These spores develop into tiny, heart-shaped gametophytes, which are much less visible and contain reproductive organs called antheridia (producing sperm) and archegonia (producing eggs). Fertilization occurs when flagellated sperm swim to an egg within an archegonium, leading to the formation of a new sporophyte, thus completing the cycle.
The presence of two distinct generations, each fulfilling different roles in reproduction and survival, highlights the complexity of fern life cycles. This alternation of generations ensures genetic diversity and allows ferns to adapt to varying environmental conditions. The gametophyte stage, though less conspicuous, plays a crucial role in the sexual reproduction phase, while the sporophyte stage is dominant and responsible for spreading spores widely.
Tina is conducting an investigation on bicycle helmet aerodynamics. She is trying to find out what kind of helmet causes the least amount of air resistance. She tested three different helmets, using the same rider each time. She recorded the time it took for the rider to complete one circuit on a track in the table below.
Helmet Time in Seconds
A 35
B 28
C 41
How could Tina get more reliable data for this experiment?
When did the first frog appear on Earth?
Answer:
The correct answer will be around 250 million years ago.
Explanation:
Frogs are the cold-blooded animals which lives in both water and land. So, they belong to the class amphibia.
The first amphibians appeared during Devonian period around 370 million years ago when life moved on land from water but the evolution of frogs is a debated topic.
Fossil evidences have shown that they evolved around 250 million years ago during the early Triassic period from Triadobatrachus, or triple frog. The earliest known true frog was tiny Vieraella species found in the South America.
Thus, frogs appeared for the first time around 250 million years ago.
In April 2009, a new strain of influenza A emerged. This strain, known as the swine flu, caused at least 95 deaths in over 40 different countries. The rapid spread of this disease can be attributed to WHAT?
Answer:
The answer is ALL OF THESE
Explanation:
In April 2009, a new strain of influenza A emerged. This strain, known as the swine flu, caused at least 95 deaths in over 40 different countries. The rapid spread of this disease can be attributed to
what body system eliminates urine as a waste product from the human body?
Each genus of organisms is divided into classes. Please select the best answer from the choices provided True or False
Answer:
true
Explanation:
If it weren't for Newton's _____ law, regarding inertia, the planets would travel in a straight line into space. Gravity is the outside force that keeps the planets in orbit about the Sun.
first
second
third
Since all living organisms use the same four nucleotides in DNA structure, what is it that makes individuals unique?
A)the incidence of the STOP codon in DNA
B)the sequence of nucleotides in the DNA
C)the location of the phosphate group on the DNA backbone
D)the number of cytosine repeats in one strand
Analyze the given diagram of the carbon cycle
An image of carbon cycle is shown. The sun, a cloud, two trees, one towards left and the other towards right, an animal, lake, and a factory are included. Arrow A points from the sun to the left tree. Arrow B points from the air above the clouds to the left tree. Arrow C points from the factory towards the air above the clouds. Arrow D points from the air to the lake labeled Carbonates in Water. Arrow E points from the label Dead Organism under the animal to label Fossils and Fossil Fuels. Arrow F points from the right tree to the air.
Part 1: Which process does arrow C represent?
Part 2 Name a process that could release the compound into the air
Part 3: explain how the elements that form it are conserved during carbon cycle
Use complete sentences to explain your answer.
Part 1: The process which arrow C represent is the burning of fossil fuels to introduce Carbon Dioxide (CO₂) into the atmosphere. This process in the Carbon Cycle is relatively new since humans weren't able to produce large amounts of Carbon Dioxide by burning fossil fuels until the Industrial Revolution. This could also represent the process of cement manufacturing since it releases CO₂ by the following reaction:
CaCO₃ → CaO + CO₂
Part 2: A process that could release the compound into the air is the burning of fuels. This is an oxidation reaction in which the carbon present in form of Hydrocarbons in the fuel is oxidized to CO₂ by the oxygen in the atmosphere. The CO₂ produced is in the gaseous state, and is incorporated into the air. It also contributes to the greenhouse effect. The combustion reaction for the most simple hydrocarbon, methane (CH₄) is shown below:
CH₄ (g) + 2O₂(g) → CO₂(g) + 2H₂O (g)
Part 3: The elements that form it are conserved during carbon cycle by the Law of Conservation of Matter. This Law states that in chemical reactions, the matter is neither produced nor consumed, it only transforms. So, during all chemical processes in the Carbon Cycle, Carbon atoms are never destroyed but they change and rearrange into different molecules. This cycle is key to the sustaining of life on Earth.
The term biology comes from the Greek word bios, meaning _____, and the noun ending -logia, meaning ?
Answer:
Life and study.
Explanation:
Biology may be defined as the field of study that study about the living organism. Different fields of biology are genetics, anatomy, physiology, molecular biology and cell biology.
Biology has been derived from the Greek word bios that means life and Logy means study. The study of the living organism is known as biology. The physical, chemical and biological structure of living organism is study in field of biology.
Thus, the answer is life and study.
As the water velocity decreases, the size of the particles that the water can transport increases. Please select the best answer from the choices provided T F
The given statement is False.
As the water velocity decreases, the size of the particles that the water can transport also decreases. For example, as the velocity of the stream increases, the stream can carry larger sediments. It is noted that the physically weathered sediments are bigger in particle size in comparison to the chemically weathered particles.
In case, if the velocity of water is too slow and the slope is too gentle, then the rate of transportation of sediments also decreases and the sediments get to pile up.
How many ways can 2 sets of chromosomes combine?
The right answer is 8,324,608.
Chromosome recombination is most often just before cell division. This phenomenon is responsible for genetic diversity and the evolution of species.
To calculate the number of recombinations between two chromosomes, the formula 2 ^ n (n being the number of chromosomes) is used.
2 ^ 23 = 8,324,608 possibilities of recombination.
Sponges reproduce asexually through a process called ______.
True or False: Kevin selected a lightweight pan in which to deep-fat fry the doughnuts. Aidan knows this is a safe procedure.
(18 POINTS)
Which of these groups of animals is endangered?
(a) Dinosaurs
(b) Killer Whales
(c) Mice
(d) Komodo Dragon
I did the research on this one and both the killer whales and the Komodo dragon are endangered, but I can't really tell which one is the answer.
The species of the habitat that are on the verge of extinction or perishment are called endangered species. Komodo Dragon is a group of animals that is endangered.
What is endangered species?The species that are most likely to become perished in the future in a particular habitat or overall on the planet is called the endangered species. This may be due to extensive hunting, habitat destruction or the introduction of non-native and competitive species.
The data about the killer whale population is deficient and cannot be categorized appropriately in the endangered category while Dinosaurs are extinct species.
Komodo Dragon is now considered an endangered species as their population had declined rapidly due to climate change and the decrease in the deer population which is their major prey are the most likely to make them vulnerable.
Therefore, option (d) Komodo dragon is an example of endangered species.
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The thick mass of grass roots that helps hold prairie soil in place is called
Answer:
It is John Deere's Plow
Explanation:
YW
Earthworms are a species of worms that lives in moist soil along with other organisms like tiny insects and bacteria. Earthworms obtain water and nutrients by eating dead plant material found in the soil. Earthworms also release waste materials that help enrich the soil. Based on this information, which sentence is correct?
Answer:
D. Soil is the earthworm’s habitat.
Explanation:
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Attempting to both study and watch television is an example of divided attention.
true or false
Attempting to both study and watch television is an example of divided attention is true. Many people are examples in this world. Multi-tasking enables a user to perform more than one job at a time.
Therefore, this condition is true and many people study in this fashion like they study and watch T.V at the same time. Divided attention is a kind of contemporary attention which enables a person to treat various type of data and to do multiple tasks at a time.
The Calvin cycle of photosynthesis begins when
A. light becomes available.
B. electrons leave a photosystem.
C. the reduction of carbon dioxide occurs.
D. carbon dioxide is attached to RuBP.
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What type of infection is transmitted by athlete's foot?
Bacterial
Fungal
Parasitic
Viral
fungal because it is a foot fungus.