1.Red-green color blindness is a sex-linked recessive trait in humans. Two peopl

Question

1.Red-green color blindness is a sex-linked recessive trait in humans. Two people with normal color vision have a color-blind son. What are the genotypes of the parents?

A. XCXC and XcY
B. XcXc and XCY
C. XcXc and XcY
D. XCXC and XCY
E. XCXc and XCY

2.In humans, male-pattern baldness is controlled by an autosomal gene that occurs in two allelic forms. Allele Hn determines nonbaldness, and allele Hb determines pattern baldness. In males, because of the presence of testosterone, allele Hb is dominant over Hn. If a man and woman both with genotype HnHb have a son, what is the chance that he will eventually be bald?
A. 0%
B. 75%
C. 33%
D. 50%
E. 25%

Explanation / Answer

1)E 2)B

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