In the fruit fly Drosophila b is a recessive mutation that r

In the fruit fly Drosophila, b is a recessive mutation that results in black body color, and vg is a recessive mutation that results in vestigial wings. Wild-type flies have tan bodies (b*) and normal (long straight) wings (vg*). Flies that are b*b vg*vg (the heterozygous parent) are test-crossed to black-bodied, vestigial-winged flies: genotype of the testcross partner. __ The offspring had the following phenotypes: Are the genes for body color and wing shape linked? (circle one) yes no If so, what is the map distance between them (in cM)?

Solution

1)     Genotype of the test cross partner is always recessive, therefore genotype of test cross partner is bb vgvg.

2)     As the genes (genes of body colour and wing) are indecently assorting in F2 generation. These genes are not the linked genes.