Suppose that in Guinea pigs ABO blood types are determined like in humans, where

Question

Suppose that in Guinea pigs ABO blood types are determined like in humans, where IA and IB are expressed co dominantly and i (blood type O) is recessive to both. During a set of routine crosses you notice something unusual: Repeated matings between a certain female with blood type AB and a certain male with blood type A produces F1 Guinea pigs of all four blood types in the following ratios: 5A : 2B : 4AB : 1O. The genotypes of the parents are most likely:

A. IA/IB for the female and IA/IA for the male.

B. IA/IB for the female and IA/i for the male.

C. IA/IB/i for the female and IA/IA for the male.

D.IA/IB/i for the female and IA/i for the male.

E None of the answer options are correct.

Explanation / Answer

IA/IB/i for the female and IA/i for the male because in F1 Guinea pigs all four blood tyes are present to get O blood group we need to have i  (blood type O) is recessive state in the given options to get O blood group we should have i in male and male so IA/IB/i for the female and IA/i for the male. is the correct option

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