Question

A normal appearing couple is found to be heterozygous recessive for albinism. Both have the genotype Aa. The gene responsible for albinism is recessive to the normal pigment-producing gene. What are the chances of their children being albino?
a. 3:4 children will be albino.
b. All children will be albino.
c. 1:4 children will be albino. A normal appearing couple is found to be heterozygous recessive for albinism. Both have the genotype Aa. The gene responsible for albinism is recessive to the normal pigment-producing gene. What are the chances of their children being albino?
a. 3:4 children will be albino.
b. All children will be albino.
c. 1:4 children will be albino. @Biology

Answer 1

3:1

Answer 2

heena's diagram shows you the right solution on how to solve this problem. It shows that there is 4 chances to see their kids' genomic combinations.

2 out of 4 possibilities of which their kids are completely normal and not a recessive carrier, 1 out of 4 possibility where their kid will be normal but is a carrier of the recessive albinism
1 out of 4 possibility where the kid will be an albino.

Ratio-wise, the answer is:

c. 1:4 children will be albino

Answer 3

Consider the following cross:
Parent 1: YyTt
Parent 2: YyTt
Using the rules of probability, determine the probability that the offspring will show YyTT genotype?