Question

can someone help me with these 3 quesfions please, thank you

Miniature wings (min) is an X-linked recessive mutation in flies. If a min-winged female is crossed to a wild-type male, what proportion of the Fį will have min wings? A. 0% B. 25% C. 50% D. 100%

Answer 1

Answer =

C. 50%

Explanation = Miniature wings (min) is an X-linked recessive mutation in flies.

If a min-winged female is crossed with a wild -type male,

The proportion of the F1 will have min wings are = 50%

Cross = min-winged female X wild -type male,

genotype = XwXw    X X+Y

F1 generation =

	Xw	Xw
X+	X+Xw (wild type female)	X+Xw (wild type female)
Y	Xw Y( Min.male)	Xw Y( Min.male)

The proportion of the F1 will have min wings are - out of 4 F1 offspring 2 are wild type females & 2 are miniature males.

$\therefore$ The proportion of the F1 will have min wings are = 2/4 = 1/2 = 0.5 = 50%

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