Your professor (sam) and his wife (becca) both have normal color vision, but their son is colorblind. what do you know about sam's and becca's genotypes?
a. sam = c+c+ becca = c+c+
b. sam = c+c becca = c+c
c. sam=cy becca=cc
d. sam = c+y becca = c+c

D. Sam = c+Y Becca = c+c

Explanation:

Colorblindness is a X-linked trait. Since Sam is a male and not colorblind, there's only one possible genotype he could have which is:

Being c+ the dominant allele for not being colorblind while c is the recessive allele associated with colorblindness.

As for Becca, in order for her to not have colorblindness but her son do, she needs to have a heterozygous genotype and pass down the recessive Y allele to her son. Becca's genotype is:

Therefore, the answer is D. Sam = c+Y Becca = c+c

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