Classical albinism results from a recessive allele.What are the expected probabilities for the progeny of an albino female and a fully pigmented male with an albino father?
A) All normal
B) 1/2 normal, 1/2 albino
C) 3/4 normal, 1/4 albino
D) 3/4 albino, 1/4 normal
E) All albino

Question

Quizplus · Accepted Answer

The albino female must have two recessive alleles for albinism (aa), while the fully pigmented male with an albino father must be heterozygous (Aa) because he has an albino father. 
- The Punnett square for this cross would be:

| a | a
--|---|---
A | Aa| Aa
a | aa| aa

- The expected probabilities for each genotype are: 
  - Aa (normal): 50%
  - aa (albinism): 50%

Therefore, the possible progeny would be 1/2 normal (Aa or AA) and 1/2 albino (aa).

Classical Albinism Results from a Recessive Allele