Answer to Question #170479 in Biology for Aliya

Question

Inheritance of Blood Type

Blood typing is determined genetically, based on the alleles inherited from either parent. There are three possible alleles that can be inherited, Ia, Ib and Io. Ia and Ib are codominant, whilst Io is recessive to both Ia and Ib.

As a result, someone with blood type AB has inherited Ia from one parent and Ib from the other, resulting in both a and b antigens present on their blood cells.

Someone with Ia blood could have inherited Ia from one parent, and either an Ia or Io allele from the other parent.

Since Io is recessive to both Ia and Ib, the only way a person can have O-type blood, and have no antigens present on the blood cells, would be for them to have inherited Io alleles from both parents.

Mix-up at the Hospital

Two sets of parents had babies on the same day at approximately the same time, at a local hospital. Somehow the hospital nursery may have mixed up the babies, and it is your job to determine which child belongs to which set of parents using your knowledge of blood type inheritance and genetics.

Use punnett squares to determine the possible offspring blood types for each set of parents, to help with your answers.

question 6:

Mr Jones has blood type A, select the possible genotype/s that would result in this blood type.

Question 6 options:

A) Io Io

B) Ia Io

C) Ia Ia

D) Ia Ib

E) Ib Io

F) Ib Ib

I think this answer is B based on the above info.... is this correct?

Mrs Jones has blood type O, select the possible genotype/s that would result in this blood type.

Question 7 options:

A) Io Io

B) Ia Io

C) Ia Ia

D) Ia Ib

E) Ib Io

F) Ib Ib

a?

Just let me know if my 2 answers are correct or not thanks.

Answer 1

Question 6.

As Mr Jones has blood type A, he may have two genotypes: I^AI^A or I^AI⁰

As a result, answers B and C are correct.

Question 7.

If Mrs Jones has blood type O, she may have only one genotype; I⁰I⁰.

As a result, answer A is correct.