Organizing Data About Expressed Traits Quick Check

Question

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Question
In a certain population of rabbits, the ratio of the phenotypes of brown fur and white fur is 1:1. What is the frequency of the white fur trait in the rabbit population?(1 point)
Responses

25%
25%

100%
100%

50%
50%

1%
1%
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Answer 1

To find the frequency of the white fur trait in a population where the ratio of brown fur to white fur is 1:1, you can use the following reasoning:

If the ratio of brown fur (B) to white fur (W) is 1:1, it means that for every brown rabbit, there is one white rabbit. This means that the total proportion of rabbits in the population is made up of both fur colors equally.

The frequency of the trait can be calculated as follows:

• Frequency of white fur trait (W) = (number of white rabbits) / (total number of rabbits)
• Since the ratio is 1:1, it implies that 50% of the rabbits have white fur.

Thus, the correct answer is 50%.

Answer 2

Kamar wants to know his mother's blood type. Kamar knows that his blood type is AB and his father’s blood type is heterozygous A. What can Kamar assume about his mother’s blood type?(1 point)
Responses

Kamar’s mother must be O because the recessive allele allows for Kamar to get type A from his father
Kamar’s mother must be O because the recessive allele allows for Kamar to get type A from his father

Kamar’s mother must be either A or O because blood type AB is considered incomplete dominant.
Kamar’s mother must be either A or O because blood type AB is considered incomplete dominant.

Kamar’s mother must be either AB or B because blood types AB is considered codominant
Kamar’s mother must be either AB or B because blood types AB is considered codominant

Kamar’s mother must be AB because blood type AB is inherited from one parent
Kamar’s mother must be AB because blood type AB is inherited from one parent
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Answer 3

To determine Kamar's mother's blood type based on the information provided, we need to consider the genetics of blood types:

1. Kamar's blood type is AB, which means he has both A and B alleles.
2. Kamar's father's blood type is heterozygous A. This means he could have either the genotype AA or AO (the latter being A from one allele and O from the other).
3. Kamar’s mother must provide the B allele for Kamar to express the AB blood type.

Given this information:

• Kamar could not inherit the B allele from the father since he's A (heterozygous A), which means he must inherit the B allele from his mother.
• Therefore, Kamar's mother must have a B allele to pass onto Kamar.

This means Kamar's mother can either be blood type B or AB. The only options that allow for Kamar to have an AB blood type, given his father's blood type, are:

• Kamar’s mother must be either AB or B because blood types AB is considered codominant.

So the correct answer is: Kamar’s mother must be either AB or B because blood types AB is considered codominant.

Answer 4

Which of the following best describes natural selection?(1 point)
Responses

The process by which organisms are separated by chance events, such as natural disasters, causing the frequency of the population to change.
The process by which organisms are separated by chance events, such as natural disasters, causing the frequency of the population to change.

When a small sample of a population leaves and establishes a new population.
When a small sample of a population leaves and establishes a new population.

The process by which organisms that are better adapted to the environment tend to survive and produce more offspring.
The process by which organisms that are better adapted to the environment tend to survive and produce more offspring.

When traits are determined by multiple genes and environmental factors and cannot be predicted using Punnett squares

Answer 5

The best description of natural selection from the options provided is:

The process by which organisms that are better adapted to the environment tend to survive and produce more offspring.

Natural selection is a mechanism of evolution whereby individuals with favorable traits are more likely to survive and reproduce, thereby passing those traits on to future generations.

Answer 6

The different variants of a trait available to a gene are called(1 point)
Responses

phenotypes.
phenotypes.

genotypes.
genotypes.

alleles.
alleles.

polygenic traits.

Answer 7

The different variants of a trait available to a gene are called alleles.

Alleles are alternative versions of a gene that can produce different traits (phenotypes) in an organism.

Answer 8

What is one similarity between genetic drift and gene flow? (1 point)
Responses

They both cause a change in the frequency of traits in a population.
They both cause a change in the frequency of traits in a population.

They are both caused by the migration of species.
They are both caused by the migration of species.

They are both caused by natural disasters, such as hurricanes.
They are both caused by natural disasters, such as hurricanes.

They both occur in a population by chance.

Answer 9

The correct similarity between genetic drift and gene flow is:

They both cause a change in the frequency of traits in a population.

Both processes can alter the genetic composition of a population, but they do so through different mechanisms. Genetic drift occurs by chance events affecting allele frequencies, while gene flow involves the transfer of alleles between populations through migration.