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

Question

Quizplus · Accepted Answer

The mother is a carrier of the red-green color blindness gene, which is X-linked recessive. She has one normal vision allele (dominant) and one color blindness allele (recessive), resulting in a normal phenotype but the ability to pass the recessive allele to her son.

Consider a Mother with Normal Vision Who Has a Son