16. In the fruit fly Drosophila melanogaster, vestigial wings and hairy body are

Question

16. In the fruit fly Drosophila melanogaster, vestigial wings and hairy body are produced by two recessive genes located on different chromosomes. The normal alleles, for long wings and hairless bodies, are both dominant. Suppose a vestigial-winged, hairy male is crossed with a homozygous normal female. (a) What phenotypes would be expected among the progeny, and what are the phenotype frequencies? (b) If the F, from this cross are permitted to mate randomly among themselves, what are the expected phenotypic frequencies in the F2?

Explanation / Answer

a) Suppose ww is reccesive allele (vestigeal wing) WW is dominant (normal) and hh is reccesive allele (hairy body) HH is dominant (normal).

Suupose a vestigeal wing and hairy body male (wwhh) is crossed with Normal homozygous female (WWHH), the possible expected phenotypes.

wwhh X WWHH

F1 generation is all WwHh all are normal Hetrozygous progeny (100 % normal heterozygous progeny)

b) If we allow to cross randomly among themself the expected phenotypic frequency in the f2 are: 9:3:3:1

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