In Drosophila the recessive alleles for white eyes is X-linked (normal eye color is red) and...

In Drosophila the recessive alleles for white eyes is X-linked (normal eye color is red) and the recessive allele for vestigial wings is autosomal. A female heterozygous for both of these traits is crossed with a white-eyed vestigial male. What proportion of the FEMALE progeny will be white-eyed with vestigial wings.?

(a) 100 % (b) 75 % (c) 50 % (d) 25 % (e) 0 %

Solutions

Expert Solution

let the alleles be Xw+ - red eye colour, Xw- white eye colour

v+- wildtype wings, v- vestigial wings

Xw+Xwv+v is the genotype of the female heterozygous for both traits.

and genotype of the male with white eyes and vestigial wings si XwYvv

Xw+Xwv+v * XwYvv

	Xw+v+	Xw+v	Xwv+	Xwv
Xwv	Xw+Xwv+v ( female with red eyes and normal wings)	Xw+Xwvv ( female with red eyes and vestigial wings)	XwXwv+v ( female with white eyes and normal wings)	XwXwvv ( female with white eyes and vestigial wings)
Yv	Xw+Yv+v( male with red eyes and normal wings)	Xw+Yvv( male with red eyes and vestigial wings)	Xw+Yv+v( male with white eyes and normal wings)	XwYvv( male with white eyes and vestigial wings)

proportion of the FEMALE progeny will be white-eyed with vestigial wings= number of females with white-eyed with vestigial wings/total number of female progenies=1/4

so the answer in percentage is 1/4100=25%

so the answer is d) 25%

gladiator answered 1 year ago

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