Question

Assertion: A woman is capable of suing a man refusing to own a child, who has a blood group O. The man has blood group B and the woman has A.
Reason: She is right as genetically he can be the father of the child.
(A)Both Assertion and reason is correct and reason us the correct explanation for assertion
(B)Both Assertion and Reason are correct but the reason is not the correct explanation for assertion
(C)Assertion is correct but the reason is incorrect
(D)Both assertion and reason are incorrect.

Answer 1

Hint: Blood groups are classified on the basis of the antigen and antibody present in the person's blood. In this case, the man probably has a genotype BI and the woman has a genotype AI.

Complete answer:
Here both the assertion and reason are correct and the reason is the correct explanation for the assertion.
The man with blood group B has genotype BI
The woman with blood group A has the genotype AI
The child has a genotype II which induces the blood group O.
This suggests that the woman and the man can have the child with blood group O as both are heterozygous for their respective blood group.

Additional Information: The ABO blood group in human blood involves two antigens and two antibodies which are antigen A and antigen B, antibody A and antibody B respectively. Thus we can classify human blood into 4 groups
1.Antigen A with antibody B
2.Antigen B with antibody A
3.Antigen AB with no antibodies
4.Antigen nil with antibody A and B.
The phenotype and genotype of blood groups are listed below-

Phenotype	Genotype
A	AA/AI
B	BB/BI
AB	AB
O	II

Therefore, Option ‘A’ is correct.

Note: From the additional information, we can evaluate the probable inheritance that occurs in the child mentioned in the question

The above diagram suggests that in this condition, the man may be the father of the child. Therefore, the woman has the right to sue him if he refuses to accept the child. However, it doesn't give concrete proof that he is the father of the child.