Question

A version of a gene is called a(n)(1 point)
Responses

allele.
allele.

gamete.
gamete.

phenotype.
phenotype.

genotype.
genotype.
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Answered by GPT-4o mini
A version of a gene is called an **allele**.
Answer
The trait for blue eyes in humans is caused by a recessive allele. If this gene is named e, what is the genotype of a blue-eyed person?(1 point)
Responses

E
E

EE
EE

Ee
Ee

ee
ee
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Answered by GPT-4o mini
The genotype of a blue-eyed person, given that the trait for blue eyes is caused by a recessive allele (e), is **ee**.
Answer
Describe the relationships among genes, DNA, and traits.(1 point)
Responses

Traits determine the DNA in genes.
Traits determine the DNA in genes.

Genes code for traits, which are composed of DNA.
Genes code for traits, which are composed of DNA.

Traits are made of genes, which are composed of DNA.
Traits are made of genes, which are composed of DNA.

Traits are determined by genes, which are composed of DNA.
Answered by GPT-4o mini
The correct response is: **Traits are determined by genes, which are composed of DNA.**
Answer
In mice, the gene for tail length has two alleles. A long tail is dominant to a short tail. If a long-tailed mouse that is heterozygous mates with a short-tailed mouse, what are the chances of having offspring with short tails?(1 point)
Responses

75%
75%

100%
100%

50%
50%

25%
25%
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Answered by GPT-4o mini
In this scenario, let's define the alleles:

- Let **L** represent the allele for a long tail (dominant).
- Let **l** represent the allele for a short tail (recessive).

The heterozygous long-tailed mouse would have the genotype **Ll**, while the short-tailed mouse would have the genotype **ll**.

When these two mice mate, the possible genotypes of their offspring would be:

- **L** (from the heterozygous parent) and **l** (from the short-tailed parent) → **Ll** (long tail)
- **l** (from the heterozygous parent) and **l** (from the short-tailed parent) → **ll** (short tail)

The Punnett square for this cross looks like this:

| | L | l |
|-----|-----|-----|
| l | Ll | ll |
| l | Ll | ll |

From this, we see that there are 2 long-tailed offspring (**Ll**) and 2 short-tailed offspring (**ll**).

So, the chances of having offspring with short tails are **50%**.
Answer
What is meant by a phenotype ratio in a Punnett square?(1 point)
Responses

the fraction of possible offspring that contain a certain allele in their genes
the fraction of possible offspring that contain a certain allele in their genes

the number of alleles in possible offspring
the number of alleles in possible offspring

the fraction of possible offspring that can be observed to have a trait
the fraction of possible offspring that can be observed to have a trait

the number of genes that are possible in offspring
the number of genes that are possible in offspring
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Answered by GPT-4o mini
The correct response is: **the fraction of possible offspring that can be observed to have a trait.**