Back to Directory
NEET BIOLOGYMedium

In a marriage between a male with blood group A and a female with blood group B, the progeny had either blood group AB or B. What could be the possible genotype of the parents?

A

IA i (Male) ; IB IB (Female)

B

IA IA (Male) ; IB IB (Female)

C

IA IA (Male) ; IB i (Female)

D

IA i (Male) ; IB i (Female)

Step-by-Step Solution

ABO blood grouping is controlled by gene I, which has three alleles: .

  1. Male (Group A): Genotype can be or .
  2. Female (Group B): Genotype can be or .
  3. Progeny: The question states progeny are either Group AB () or Group B ().
  4. Analysis:
  • For offspring to be Group B ( or ), the male must contribute an 'i' allele (since he is Group A, he cannot contribute ). Thus, the male must be heterozygous ().
  • For offspring to include Group AB (), the female must contribute and the male .
  • If the female were heterozygous (), the cross would produce offspring with Group A () and Group O () as well . Since only AB and B are observed, the female must be homozygous dominant ().
  • Cross: Male () Female () Progeny: (AB) and (B).
Practice Mode Available

Master this Topic on Sushrut

Join thousands of students and practice with AI-generated mock tests.

Get Started
Solved: BIOLOGY Question for NEET | Sushrut