Question

Which of the following parental phenotypes would produce offspring with blood group phenotypes in the expected ratio of 1 type A: 1 type B?

	Blood group of Mother	Blood group of Father
i	A	B
ii	AB	AB
iii	AB	B
iv	AB	O

(A) A-III; B-V; C-IV; D-II
(B) A-II; B-IV; C-V; D-I
(C) A-II; B-IV; C-V; D-III
(D) A-III; B-V; C-IV; D-I

Answer 1

Hint: The question here is talking about the ABO blood group system present in humans. We need to know that A blood group cam have either ${{I}^{A}}$${{I}^{A}}$or ${{I}^{A}}{{I}^{O}}$alleles and B blood group can have either${{I}^{B}}{{I}^{B}}$or ${{I}^{B}}{{I}^{O}}$and O blood group has $ii$alleles. We’ll cross the given phenotypes one by one to get the desired combination asked in the question.


Complete Step by Step Answer:
The presence or absence of two antigens on the surface of red blood cells determines the ABO blood group. The names of these antigens are A and B. You have type A blood if the antigen A is present on your red blood cells. You have type B blood if the antigen B is present on your red blood cells. You have type AB blood if your red blood cells contain both antigens (A and B). Furthermore, if neither antigen (A nor B) is present on your red blood cells, you have type O blood.
According to the given question we need to find the combination in which we get the phenotypic ratio as 1 type A:1 type B.
The father's genotype would be${{I}^{O}}{{I}^{O}}$, while the mother's would be${{I}^{A}}{{I}^{B}}$. As a result, there is an equal chance that their kids will have the two genotypes IAIO and IBIO. As a result, there would be one type A and one type B of phenotypic.
Therefore the correct option will be D.

Note: The antigens can be amino acids, carbohydrates, or other cell receptors like glycoproteins and glycolipids, depending on the blood group system. The AB positive blood group is a universal acceptor because it lacks antibodies to A, B, and Rh, which allows it to accept blood from any blood type without causing coagulation in the host.