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You cross a p+/v+ p+/v+ male drosophila to a p-/v- p-/v- and obtain the F1 hybrid. Now you cross the F1 male with double recessive female. What will be the recombination phenotype in F2?(a) p+/v+ p-/v- only(b) p+/v+ p-/v- and p-/v- p-/v-(c) p+/v+ p-/v- and p-/v- p-/v- also p+/v- p-/v- and p-/v- p-/v-(d) p+/v+ p-/v- and p-/v- p-/v- also p-/v+ p-/v- and p-/v- p-/v-The question was posed to me in quiz.This key question is from Linkage and Crossing Over topic in portion Genetic Recombination of Cytogenetics

Answer»

Correct ANSWER is (b) p+/v+ p-/v- and p-/v- p-/v-

The BEST explanation: In MALE drosophila RECOMBINATION is ABSENT thus there can’t be formation of p+/v- and p-/v+ gametes at all. This can however be formed in case we use female F1 for the test cross.



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