Two true-breeding mutant strains of Drosophila have black body color instead of the wild-type gray yellow. When the two strains are crossed, all the F1 flies have wild-type body color. How can these data be interpreted?
A) Recombination occurred.
B) The mutations involved are on two different genes.
C) Complementation occurred.
D) Both B and C
E) A new mutation occurred in all the offspring.

Question

Quizplus · Accepted Answer

The F1 flies having wild-type body color suggests that the mutations are in different genes, allowing for complementation to occur, which restores the wild-type phenotype.

Two True-Breeding Mutant Strains of Drosophila Have Black Body Color