In Drosophila, the genes for body color and wing length are found on the X chromosome. Gray bodies ($$y^+$$) are dominant to yellow bodies ($$y$$) and long wings ($$m^+$$) are dominant to miniature wings ($$m$$). A male fly with a gray body and miniature wings is crossed to a female with genotype $$X^{y^+m}X^{ym^+}$$. Select the progeny that can be identified by phenotype alone that would be considered recombinant. Check All That Apply Gray body, miniature wings Gray body, long wings Females with gray bodies and long wings Females with yellow bodies and miniature wings
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The male fly has a gray body and miniature wings. Since these genes are X-linked, the male's genotype is $$X^{y^+m}Y$$. The female fly has the genotype $$X^{y^+m}X^{ym^+}$$. Phenotypes of the female's chromosomes: $$X^{y^+m}$$: Gray body, miniature wings (parental Show more…
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In Drosophila, yellow body is due to an X-linked gene that is recessive to the gene for gray body. a. 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. b. If the F2 flies in part (a) mate randomly, what are the expected phenotypic proportions of flies in the F3?
Anand J.
A yellow body in Drosophila is caused by a mutant allele $y$ of a gene located at the tip of the $X$ chromosome (the wild-type allele causes a gray body). In a radiation ex periment, a wild-type male was irradiated with X rays and then crossed with a yellow-bodied female. Most of the male progeny were yellow, as expected, but the scanning of thousands of flies revealed two gray-bodied (phenotypically wild-type) males. These gray-bodied males were crossed with yellow-bodied females, with the following results:a. Explain the origin and crossing behavior of gray male 1 b. Explain the origin and crossing behavior of gray male 2
In Drosophila, yellow body color is due to an X-linked gene that is recessive to the gene for gray body color, (FIGURE CAN'T COPY)a. A homozygous gray female is crossed with a yellow male. The $\mathrm{F}_{1}$ are intercrossed to produce the $\mathrm{F}_{2} .$ Give the genotypes and phenotypes, along with the expected proportions, of the $\mathrm{F}_{1}$ and $\mathrm{F}_{2}$ progeny. b. A yellow female is crossed with a gray male. The $\mathrm{F}_{1}$ are intercrossed to produce the $\mathrm{F}_{2}$. Give the genotypes and phenotypes, along with the expected proportions, of the $\mathrm{F}_{1}$ and $\mathrm{F}_{2}$ progeny. c. A yellow female is crossed with a gray male. The $\mathrm{F}_{1}$ females are backcrossed with gray males. Give the genotypes and phenotypes, along with the expected proportions, of the $\mathrm{F}_{2}$ progeny. d. If the $\mathrm{F}_{2}$ flies in part $b$ mate randomly, what are the expected phenotypes and proportions of flies in the $\mathrm{F}_{3} ?$
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