Albinism results from a recessive allele. Which of the following describes the expected offspring from a normally pigmented male (who had an albino father) and an albino wife?
A) All normal
B) 75% albino; 25% normal
C) 75% normal; 25% albino
D) All albino
E) 50% normal; 50% albino

Question

Quizplus · Accepted Answer

The normally pigmented male must be heterozygous (carrying one normal and one albino allele) because he had an albino father, indicating he carries the recessive albino allele. An albino individual must have two copies of the recessive allele. When a heterozygous individual mates with a homozygous recessive individual, the offspring have a 50% chance of being heterozygous (and thus normally pigmented) and a 50% chance of being homozygous recessive (and thus albino).

Albinism Results from a Recessive Allele