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In bats the progeny with Qq die. If you cross two wild type bats which are homozygous for dominant and recessive form of the trait, what will be the expected ratio of the F1?

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In bats the progeny with Qq die. If you cross two wild type bats which are homozygous for dominant and recessive form of the trait, what will be the expected ratio of the F1?

(a) All heterozygote

(b) 3:1

(c) 1:2:1

(d) No ratio

I had been asked this question at a job interview.

The origin of the question is Numerical Problems topic in section Mendelian Genetics of Cytogenetics

1 Answer

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Correct choice is (d) No ratio

Easiest explanation: Cross between QQ and qq will always result in Qq which is lethal. This prevents generation of any heterozygote or rather any progeny by mating of these two bats.

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