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
X^R X^R	Normal Vision
X^R X^r	Normal vision, "carrier"
X^r X^r	Red-green color blind

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