Consider the genetic cross for blood type of these two parents. The father is type A and the mother is type B. Both have the recessive allele for blood type 0. What is the probability that these parents will have offspring with type A blood? 0% 10% 25% 50%
Biology · Middle School · Thu Feb 04 2021
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To calculate the probability that the parents will have offspring with type A blood, we first need to understand their genotypes. Since both parents have the recessive allele for blood type O, their genotypes are AO for the father and BO for the mother.
The possible allele combinations from the parents are as follows:
- Father (AO) can contribute either A or O - Mother (BO) can contribute either B or O
Using a Punnett square, we can list the possible outcomes:
______|_A__|_O_ B | AB | BO O | AO | OO
The genotypes resulting from this cross are: - AB: Type AB blood - BO: Type B blood - AO: Type A blood - OO: Type O blood
There are four equally probable outcomes, and one of these (AO) is Type A blood. Therefore, the probability that these parents will have offspring with type A blood is 1 out of 4, or 25%.