Question

Parent 1 is heterozygous for blood type (A). Parent 2 is heterozygous for blood type (A). What is the probability that they would have a child with type A blood?

a) 0%
b) 25%
c) 50%
d) 75%

Answer 1

The probability of the parents having a child with type A blood is d) 75%.

Step-by-step explanation:

In this case, both parents have blood type A and are heterozygous, meaning they each have one copy of the A allele and one copy of the O allele. When these two parents have a child, there are four possible combinations of alleles that the child can inherit: AA, AO, AO, and OO. Out of these four possibilities, three of them result in the child having type A blood (AA, AO, and AO). Therefore, the probability of the parents having a child with type A blood is 3 out of 4, or 75%. So, the correct answer is d) 75%.