Kamar wants to know his mother's blood type. Kamar knows that his blood type is AB and his father's blood type is heterozygous A. What can Kamar assume about his mother's blood type? (1 point)

Question

• Kamar's mother must be either AB or B because blood types AB is considered codominant
• Kamar's mother must be AB because blood type AB is inherited from one parent
• Kamar's mother must be either A or O because blood type AB is considered incomplete dominant.
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Kamar's mother must be O because the recessive allele allows for Kamar to get type A from his father

Answer 1

To determine Kamar's mother's blood type based on the information given, we need to analyze Kamar's blood type (AB) and his father's blood type (heterozygous A).

1. Kamar's blood type is AB, meaning he has both A and B alleles (genotype AB).
2. Kamar's father has a heterozygous A blood type, which means he has either genotype AA or AO.

Since Kamar has the AB blood type, he must have inherited one allele from each parent. The possible combinations for Kamar's blood type given his father's heterozygous A (AA or AO) and the requirement to produce an AB child are:

• If the father is AA: The sperm can only contribute A, so the mother must provide the B allele for the child to be AB. That means Kamar's mother must be either AB or B.
• If the father is AO: The father's sperm can contribute either A or O. For Kamar to be AB, the mother must contribute a B allele again, meaning she must be either AB or B.

Thus, the only options for Kamar's mother, considering he is AB with a father who has heterozygous A, are that she is either AB or B.

Given this analysis, the correct answer is:

Kamar's mother must be either AB or B because blood types AB is considered codominant.