In Drosophila Melanogaster,vestigial Wings Are Caused by a Recessive Allele

Multiple Choice

In Drosophila melanogaster,vestigial wings are caused by a recessive allele of a gene that is linked to a gene with a recessive allele that causes black body color.Morgan crossed black-bodied normal-winged females and gray-bodied vestigial-winged males.The F₁ were all gray bodied,normal winged.After examining the F₂ progeny,Morgan calculated the map distance to be 17 map units.Which of the following is correct about the F₂ progeny?

A) black-bodied normal-winged flies = 17%
B) black-bodied,normal-winged flies PLUS gray-bodied,vestigial-winged flies = 17%
C) gray-bodied,normal-winged flies PLUS black-bodied,vestigial-winged flies = 17%
D) black-bodied,vestigial-winged flies = 17%