PART 1 Answer (with attached image) Red eye and white eye flies have a ratio of
ID: 94640 • Letter: P
Question
PART 1 Answer (with attached image) Red eye and white eye flies have a ratio of 1:1PART 2 QUESTION: As in the question above, if you cross the female F1 flies derived from the cross above with a red eye male, in theory, what kind of phenotype will you expect for the progeny? A. All female showing white eyes B. All male showing red eyes C. Red eye and white eye flies have a ratio of 3:1 D. Red eye and white eye flies have a ratio of 1:1 E. None of the above
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Explanation / Answer
PART 1--Red eye male fly (WW) x heterozygous red eye female (Ww), so F1 generation will be according to Punnett square---
The gametes formed will be W,W and W,w for the male and female respectively and then they will recombine as shown below---
WW, Ww, WW, Ww so the progeny formed will be in the genotypic and phenotypic ratio 2:2 or 1:1.
male in F1 generation are--WW and WW and female in F1 generation are Ww and Ww.
CASE1--F2 cross between heterozygous red eye female Ww and red eye male WW.
PART 2 female F1 flies are Ww and Ww and crossed with male flies WW and WW, so according to Punnett square,
So phenotypic expression and genotypic expression in F2 generation will be --2:2 or 1:1 as heterozygous red eye female Ww and red eye male WW.
answer-E) none of the above.
CASE 2--F2 cross between white eye female ww with red eye male WW.
cross F2 ww (white eye female) with WW red eye male will produce the progeny as given in punnett square--
the progeny in F2 will be generation will be all heterozygous red eye female Ww.
answer--E)none of the above.
Cross between male and female fly F2 W w W WW Ww W WW WwRelated Questions
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