Question

In Drosophila flies, red eyes (R) are dominant to white eyes (r) and normal wings (W) are dominant to vestigial wings (w). Double heterozygotes WwRr are produced by crossing WWRR with a wwrr. A test cross was made by mating a RrWw fly with an rrww fly. The offspring phenotype numbers were (i) Red-eyed, normal wings: 368 (ii) Red-eyed, vestigial wings: 56 (iii) White-eyed, vestigial wings:336 (iv) White-eyes, normal wings: 40. What is the recombination frequency, as expressed as a percentage, for this cross?

Answer 1

Answer:

In Drosophila flies, red eyes (R) are dominant to white eyes (r) and normal wings (W) are dominant to vestigial wings (w). Double heterozygotes WwRr are produced by crossing WWRR with a wwrr. A test cross was made by mating a RrWw fly with an rrww fly. The offspring phenotype numbers were (i) Red-eyed, normal wings: 368 (ii) Red-eyed, vestigial wings: 56 (iii) White-eyed, vestigial wings:336 (iv) White-eyes, normal wings: 40. What is the recombination frequency, as expressed as a percentage, for this cross?

Explanation:

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Answer 2

In Drosophila flies, red eyes (R) are dominant to white eyes (r) and normal wings (W) are dominant to vestigial wings (w). Double heterozygotes WwRr are produced by crossing WWRR with a wwrr. A test cross was made by mating a RrWw fly with an rrww fly. The offspring phenotype numbers were (i) Red-eyed, normal wings: 368 (ii) Red-eyed, vestigial wings: 56 (iii) White-eyed, vestigial wings:336 (iv) White-eyes, normal wings: 40. What is the recombination frequency, as expressed as a percentage, for this cross?