In the fruit fly, drosophilia melanogaster, a known deletion on the X chromosome

Question

In the fruit fly, drosophilia melanogaster, a known deletion on the X chromosome removes both a gene involved in fly development and the gene for eye color...

Map Sapling Learning In the fruit fly, Drosophila melanogaster, a known deletion on the X chromosome removes both a gene involved in the fly's development and the gene for eye color. The deletion is lethal when homozygous or hemizygous. Flies that are heterozygous for the mutation are viable, but have indentations at the wing margin. Therefore, the deletion is named the Notch mutation. The allele for wild type eyes is dominant over the allele for white eyes. Predict the phenotypic ratio of the offspring from a cross between a white-eyed notched female and a wild type male. O 1 white-eyed female 1 notched female 1 white-eyed male O 1 white-eyed notched female 1 wild type female 1 white-eyed notched male 1 wild type male O 1 wild type female 1 notched female 1 white-eyed male O 1 wild type female 1 notched female 1 white-eyed male 1 notched male

Explanation / Answer

Answer: 1 Wild-type female : 1 notched female : 1 white-eyed male

Explanation:

Notched= N; wild=n

White-eye= w; Normal-eye=W

Xw NXw n       x     XNWY ----Partents

XWN    

Y

Xw N

Xw N XWN (Wild-type female)

Xw N Y (Lethal)

Xw n       

Xw n    XWN (notched-female)

Xw n Y (white-eyed male)

XWN    

Y

Xw N

Xw N XWN (Wild-type female)

Xw N Y (Lethal)

Xw n       

Xw n    XWN (notched-female)

Xw n Y (white-eyed male)

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