Question

The recessive alleles for yellow body (yb) and cut wings (cw) identify two autosomal genes on the second chromosome of Drosophila melanogaster. When females, heterozygous at these two genes (yb+yb cw+cw), were crossed with yellow-bodied, cut-winged males, the following classes and numbers of progeny (out of 1000) were obtained:

a. wild type body color, wild type wings 120
b. wild type body color, cut wings 360
c. yellow body color, cut wings 140
d. yellow body color, wild type wings 380

Answer 1

Option D

Step-by-step explanation:

Given -

recessive alleles for yellow body is (yb) and cut wings is (cw)

Genotype of female parent which is heterozygous at these two genes - yb+yb cw+cw

Genotype of male with yellow-bodied, cut-winged is (ybyb, cwcw)

Cross between

yb+yb cw+cw & ybyb cwcw will produce following offspring

Please see the attached file

Hence, option D is correct