Consider a mother with normal vision who has a son with red-green color blindness. The mother was a "carrier" of the affected gene, as she had a normal phenotype but

A. two recessive alleles.
B. an incompletely penetrating genotype.
C. two dominant alleles.
D. one dominant and one recessive allele.
E. a codominant set of alleles.


Answer: D

Anatomy & Physiology

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