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Both parents have AB blood. What is the probability they will have a child that has type A blood? Group of answer choices75%100%25%0%50%

Question

Both parents have AB blood. What is the probability they will have a child that has type A blood? Group of answer choices75%100%25%0%50%

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Solution

The blood type of a child depends on the alleles that each parent carries and passes on. The AB blood type is co-dominant, meaning that if a person receives an A allele from one parent and a B allele from the other, they will have AB blood type.

Here are the possible combinations of alleles that each parent with AB blood can pass on: A or B.

So, if both parents have AB blood, the possible combinations for their children could be:

  • AA (from receiving an A from each parent)
  • AB (from receiving an A from one parent and a B from the other)
  • BA (from receiving a B from one parent and an A from the other, which is the same as AB)
  • BB (from receiving a B from each parent)

So, the child has a 25% chance of having AA blood type (which would result in type A blood), a 50% chance of having AB blood type, and a 25% chance of having BB blood type (which would result in type B blood).

Therefore, the probability that they will have a child with type A blood is 25%.

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