Question In Dasaaria he two genes mand snare Xlinked and 25

Question In Dasaaria, he two genes mand snare X-linked and 25 map units apart. A female fly of genotype w simonis crossed to a male from a wild-type line. What percent of male progeny will be m si Answer 12.5% 25% 37.5% 50%

Solution

If alleles are linked in 7 mu then they are 14 % linked or 100-14 = 86 % unlinked. The progenies would be 14 % cv-c Sb+.

The rest of progenies would share 86% and wild type will get 0.43 or 43%.

So the option 4 is correct.

2.

w+ sri+ / w sri                         x                      w+ sri+/ 0

Gametes Female(down) Male(right)

W+sri+

0

W+sri+

W+sri

W+sri/0

Wsri+

Wsri

There would be 1 among 8 genotypes that have male with w+sri/0 genotype. So the probability would be

1/8 x 100 = 12.5

Gametes Female(down) Male(right)	W+sri+	0
W+sri+
W+sri		W+sri/0
Wsri+
Wsri