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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)

Responses

Kamar’s mother must be either A or O because blood type AB is considered incomplete dominant.
Kamar’s mother must be either A or O because blood type AB is considered incomplete dominant.

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

Kamar’s mother must be O because the recessive allele allows for Kamar to get type A from his father
Kamar’s mother must be O because the recessive allele allows for Kamar to get type A from his father

Kamar’s mother must be AB because blood type AB is inherited from one parent
Kamar’s mother must be AB because blood type AB is inherited from one parent

1 answer

To determine Kamar's mother's possible blood type, let's break it down based on Kamar's blood type and his father's blood type.

  1. Kamar's Blood Type: AB (genotype: I^A I^B)
  2. Father's Blood Type: Heterozygous A (genotype: I^A I^O)

Now, Kamar can inherit one allele from each parent. Since Kamar has blood type AB, he must have inherited the I^A allele from his father (because he has an A allele) and the I^B allele from his mother (because he has a B allele).

This means that Kamar's mother must have an I^B allele to be able to pass that on to Kamar. The possible blood types for Kamar's mother that would contain the I^B allele are:

  • Type B (genotype: I^B I^B or I^B I^O)
  • Type AB (genotype: I^A I^B)

Kamar's mother cannot be type A or type O because neither has the I^B allele.

So, the correct response is:

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