Two parents each have blood type AB, and their first child is blood type AB. What is the probability that their second child will have blood type AB? (Express the probability as a percent. Enter the number only without the percent sign. For example, enter 100% as 100 and enter 12.5% as 12.5.)
Question
Two parents each have blood type AB, and their first child is blood type AB. What is the probability that their second child will have blood type AB? (Express the probability as a percent. Enter the number only without the percent sign. For example, enter 100% as 100 and enter 12.5% as 12.5.)
Solution
The blood type of a child is determined by the alleles they inherit from their parents.
Parents with AB blood type each have two types of alleles: A and B.
When they have a child, each parent gives one of their alleles to the child.
The possible combinations for the child are: AA, AB, BA, or BB.
However, since the blood types A and B are co-dominant, the combinations AA and BB will result in blood types A and B respectively, while AB and BA will result in blood type AB.
Therefore, the probability of their second child having blood type AB is 50%.
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