Organizing Data About Expressed Traits Quick Check

Question

2 of 52 of 5 Items
Question
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 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 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 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

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
Skip to navigation

Answer 1

To determine Kamar's mother's possible blood types, let's consider the blood types involved:

• Kamar's blood type is AB (genotype: AB).
• Kamar's father's blood type is heterozygous A (genotype: AO). This means he can pass either an A allele or an O allele to Kamar.

For Kamar to have blood type AB, he must inherit an A allele from his father and a B allele from his mother.

Given this information, Kamar's mother must have at least one B allele. The possible blood types for Kamar's mother are:

1. AB (which has A and B alleles)
2. B (which has B and O alleles)

Thus, Kamar's mother cannot be type O or type A, since these would not provide the necessary B allele for Kamar’s AB blood type.

Now we can assess the answer choices:

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

   • This is a correct statement based on the reasoning above.

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

   • Incorrect; A or O cannot provide the B allele.

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

   • This is partially correct, but Kamar's mother could also be B.

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

   • Incorrect; type O cannot provide the necessary B allele.

The best assumption Kamar can make about his mother's blood type is:

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