Question

1. The genes B, Q and R are located on a chromosome as shown below: B...

1. The genes B, Q and R are located on a chromosome as shown below: B 40 cM Q 30 cM R B, Q and R are completely dominant to b, q and r. In the cross, B r X b r b R b r What is probability of obtaining offspring which are homozygous recessive for b and r?

A. 0.35 B. 0.70 C. 0 D. 0.25 E. 0.50

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Answer #1

Ans)d)0.25

Explaination:

The recombination distance between B and R is=BQ+QR=40+30=70cM

Maximum recombinant frequency possible is 50cM which indicate genes are unlinked and present on different chromosomes.

So thes B and R genes are present on separate chromosomes and both genes independently assort from each other during gamete formation.

P genotype: Br br x bR br

Gametes: Br, br bR ,br

F1:

BbRr Bbrr
bbRr bbrr

Probability of homozygous recessive for b and r ie, bbrr=1/4=0.25

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