Color Blindness Problem Set

Problem 1: Audrei's genotype

Audrei is the family member who contacted us. She and her father Sydney are color blind, but her mother, Barbara, has normal vision. What is Audrei's genotype?

You answered: A. homozygous for the dominant, normal vision allele
Audrei is color blind. If she were homozygous for the dominant allele, she would have normal vision.
Female Genotype Female Phenotype
XR XR Normal Vision
XR Xr Normal vision, "carrier"
Xr Xr Red-green color blind

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