A recently married couple would like to start a family. They are both heterozygous for albinism,...
A recently married couple would like to start a family. They are both heterozygous for albinism, a recessive genetic disorder. They would like to have three children.
A. What is the probability that their first child would be albino? A. _____________________________
B. What is the probability that their first and second and third child would be albino? B. _____________________________
C. What is the chance that they will have 3 girls that are all albino? C. _____________________________
D. What is the chance that they will have 3 boys that are all albino? D. ________________
Homework Answers
Suppose both the parents have Aa genotype.
Aa x Aa
| A | a | |
| A | AA | Aa |
| a | Aa | aa |
A) chance of the 1st child to be born with albino is 1/4.
B) The probability for each child being born is the same; therefore 1st, 2nd, and 3rd child to have albino is 1/4*1/4*1/4= 1/64.
C) The probability of having a girl = ½. The probability of having a girl with albino is ¼ * ½ = 1/8. The probability of having three girls with albino = 1/8 * 1/8 * 1/8= 1/512.
D) The probability of having a boy = ½. The probability of having a boy with albino is ¼ * ½ = 1/8. The probability of having three boys with albino = 1/8 * 1/8 * 1/8= 1/512.
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