ratio of phenotypes in the F2 generation

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ratio of phenotypes in the F2 generation

Post by Tommy » Mon Jan 16, 2006 7:48 pm

In fruit flies, normal long wings are dominant (V) and vestigial (shortened) wings are recessive (v).These genes are autosomal.The sex-linked gene controlling red eye color (W) is dominant to white eyes (w).A male with red eyes and normal wings mates a white-eyed vestigial-winged female.
What is the expected ratio of phenotypes in the F2 generation??

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King Cobra
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Post by Dr.Stein » Tue Jan 17, 2006 5:18 am

V = normal (long wings)
v = vestigial (short wings)
autosomal genes

W = red eye
w = white eye
sex-linked gene ---> in X-chromosome

P: W - V V x w w v v

male = W V (red eye, normal wings), - V (white eye, normal wings)
female = w v (white eye, vestigial)

F1: (1) W w V v (female red eye, normal wings), (2) w - V v (male white eye, normal wings)

P2: W w V v x w - V v

female = W V , W v , v W , v w
male = w V , w v , - V , - v

F2: .............................. I am sure you can continue this by yourselves, this is easy. Ooh I am tired typing this way :lol: Do it here and let me check then. Good luck ;)

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