Color Blindness Problem Set

Problem 2: Sidney's genotype

Now that we determined that Audrei is homozygous recessive for the red-green color blind allele. What is her father's genotype?

You answered: A. hemizygous with a dominant allele
Audrei's father is color blind. If he were hemizygous with a dominant allele, he would have normal vision.
Male Genotype Male Phenotype
XR Y Normal Vision
Xr Y Red-green color blind

The Biology Project
University of Arizona
Saturday, October 10, 1998
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