In Drosophila,the Allele Red Eyes (Bw+)is Dominant to the Allele

question 51

Multiple Choice

In Drosophila,the allele red eyes (bw+) is dominant to the allele for brown eyes (bw) .At another gene locus on the same chromosome,the allele for thin wing veins (hv+) is dominant to the allele for heavy wing veins (hv) .Flies homozygous for bw and hv+ are crossed to flies homozygous for bw+ and hv to obtain doubly heterozygous F₁ progeny.
-What would be the results of a test cross with the F₁ flies?

• A)1 brown eye,thin wing veins: 1 red eye,heavy wing veins
• B)1 brown eye,heavy wing veins: 1 red eye,thin wing veins
• C)1 brown eye,thin wing veins: 2 red eye,thin wing veins: 1 red eye,heavy wing veins
• D)1 brown eye,heavy wing veins: 2 red eye,thin wing veins: 1 red eye,thin wing veins

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