Female flies homozygous for gray body blk and red eyes v wer

Female flies homozygous for gray body (blk^+) and red eyes (v^+), were crossed with male flies with black body (blk) and vermilion eye colour (v). All the F_1 generation had gray bodies and red eyes. The F1 females were testcrossed to black-bodied, vermilion-eyed males. The F2 progeny were sorted by phenotype and counted: 162 gray-bodied, red-eyed flies; 149 black-bodied, vermilion-eyed flies; 77 gray-bodied, vermilion- eyed flies; and 72 black-bodied, red-eyed flies. Calculate the frequency of recombination.

Solution

Recombination frequency = (No of recombinant / total progeny) x 100

No. of recombinanats= 77 +72 = 149

Total no. of progeny = 162 + 149 + 77 + 72 = 460

Recombination frequency = 32.39 % or 0.3239