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

Question 33

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.
-Given that these two gene loci are very closely linked,the phenotypic ratio in the F2 generation should be closest to


A) 1 brown eye,heavy wing veins: 2 red eye,thin wing veins: 1 brown eye,thin wing veins
B) 1 brown eye,thin wing veins: 2 red eye,thin wing veins: 1 red eye,heavy wing veins
C) 3 red eye,thin wing veins: 1 brown eye,heavy wing veins
D) 1 brown eye: 1 red eye: 1 heavy wing veins: 1 thin wing veins

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