In Drosophila, yellow body color is due to an X-linked gene that is recessive to the gene for gray body color. [Courtesy Dr. Masa-Toshi Yamamoto, Drosophila Genetic Resource Center, Kyoto Institute of Technology.) a. A homozygous gray female is crossed with a yellow male. The F, are intercrossed to produce the F2. Give the genotypes and phenotypes, along with the expected proportions, of the F, and F2 progeny. b. A yellow female is crossed with a gray male. The F1 are intercrossed to produce the F2. Give the genotypes and phenotypes, along with the expected proportions, of the F1 and F2 progeny. c. A yellow female is crossed with a gray male. The F females are backcrossed with gray males. Give the genotypes and phenotypes, along with the expected proportions, of the F2 progeny. d. If the F2 flies in part b mate randomly, what are the expected phenotypes and proportions of flies in the F3?

Question
In Drosophila, yellow body color is due to an X-linked gene that is
recessive to the gene for gray body color.
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Transcribed Image Text

In Drosophila, yellow body color is due to an X-linked gene that is recessive to the gene for gray body color.

[Courtesy Dr. Masa-Toshi Yamamoto, Drosophila Genetic Resource Center, Kyoto Institute of
Technology.)
a. A homozygous gray female is crossed with a yellow male. The F, are
intercrossed to produce the F2. Give the genotypes and phenotypes, along
with the expected proportions, of the F, and F2 progeny.
b. A yellow female is crossed with a gray male. The F1 are intercrossed to
produce the F2. Give the genotypes and phenotypes, along with the
expected proportions, of the F1 and F2 progeny.
c. A yellow female is crossed with a gray male. The F females are
backcrossed with gray males. Give the genotypes and phenotypes, along
with the expected proportions, of the F2 progeny.
d. If the F2 flies in part b mate randomly, what are the expected
phenotypes and proportions of flies in the F3?
Expand
Transcribed Image Text

[Courtesy Dr. Masa-Toshi Yamamoto, Drosophila Genetic Resource Center, Kyoto Institute of Technology.) a. A homozygous gray female is crossed with a yellow male. The F, are intercrossed to produce the F2. Give the genotypes and phenotypes, along with the expected proportions, of the F, and F2 progeny. b. A yellow female is crossed with a gray male. The F1 are intercrossed to produce the F2. Give the genotypes and phenotypes, along with the expected proportions, of the F1 and F2 progeny. c. A yellow female is crossed with a gray male. The F females are backcrossed with gray males. Give the genotypes and phenotypes, along with the expected proportions, of the F2 progeny. d. If the F2 flies in part b mate randomly, what are the expected phenotypes and proportions of flies in the F3?

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