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

question 7

Multiple Choice

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)Complementation occurred.
• C)The mutations involved are on two different genes.
• D)A new mutation occurred in all the offspring.
• E)Both B and C

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