1. A version of a gene is called a(n)

karyotype.
autosome.
allele.
phenotype.

2. If a father is affected by an X-linked dominant condition and the mother is not, which children can inherit the condition?
only males
both males and females
only females
neither males nor females

3. If a mother is affected by an X-linked dominant condition and the father is not, which children can inherit the condition?

neither males nor females
only males
only females
both males and females

4. How can a female inherit red-green color blindness?

Her mother is a carrier, and her father has the condition.
Females cannot inherit red-green color blindness.
Her mother is not a carrier, and her father has the condition.
Her mother is a carrier, and her father does not have the condition.

5. A purebred tall pea plant is cross-pollinated with a tall, heterozygous pea plant. Use a Punnett square to determine the probability the offspring inherit a recessive short allele.

25%
0%
75%
50%

1. A version of a gene is called a(n)?

(A. allele)

2. 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?
(2. D. ee)

3. Describe the relationships among genes, DNA, and traits.
(A.Traits are determined by genes, which are composed of DNA.)

4. 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?
(D. 50%)

5.What is meant by a phenotype ratio in a Punnett square?What is meant by a phenotype ratio in a Punnett square?
(C. the fraction of possible offspring that can be observed to have a trait.)

1. allele

2. ee
3. Traits are determined by genes, which are composed of DNA.
4. 50%
5. the fraction of possible offspring that can be observed to have a trait

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