question_answer

Direction Read the following and answer the questions from given below In court, a woman of AB blood group claims that a man of O blood group is the father of her son having O blood group. The judge orders to take the help of a geneticist to solve the problem. Finally, it was concluded that man of O blood group was not the father of woman's son.

(v) Four children belonging to the same parents have the following blood groups A, B, AB and O. Hence, the genotypes of the two parents are

 

A) parents are homozygous for 'A' group

B) one parent is homozygous for 'A' and another parent is homozygous for 'B'

C) one parent is heterozygous for 'A' and another parent is heterozygous for 'B'

D) parents are homozygous for 'B' group

Correct Answer: C

Solution :

[c] Four children belonging to the same parents will have the blood groups A, B, AB and O, if the genotypes of one parent is heterozygous for 'A' (\[{{I}^{A}}{{I}^{O}}\]) and another parent is heterozygous for 'B' (\[{{I}^{B}}{{I}^{O}}\]). It is illustrated below \[{{I}^{A}}{{I}^{B}}\] == AB blood group \[{{I}^{A}}{{I}^{O}}\] == A blood group \[{{I}^{B}}{{I}^{O}}\] B blood group \[{{I}^{O}}{{I}^{O}}\] == 0 blood group