Question

Two individuals decide to have children. The expected blood group genotypes are 50% of blood type A, and 25% each of blood types AB and B. What genotypes are the parents?
A. IA i x ii
B. IB i x IA IB
C. IA i x IA IB
D. IA i x IB i

Answer 1

Answer:

C. IA i x IA IB

Explanation:

If one individual is with genotype IA i it means that it has A blood type. This is because IA allele is dominant over i allele. Another individual with genotype IAIB has th AB blood type because allele IA is codominant to allele IB (both alleles are expressed when are together in heterozygous).

P: IAi x  IAIB

F1: IAIA  IAIB  IAi  IBi

IAIA and IAi are genotypes that will give A blood (1/2)

IAIB- AB blood type (1.4)

IBi- B blood type (1/4)