The genes for vermilion (v) eyes, sable (s) body colo and forked () bristles are

Question

The genes for vermilion (v) eyes, sable (s) body colo and forked () bristles are on the X-chromosome Drosophila melanogaster. They map in the order vsj with. 10 map units between v and s and 14 map units between s andf. Suppose that you cross awld- type male with a v s ffemale and then testcross the F, females. (a) Indicate the progeny classes and their expected numbers among 2000 total progeny, assuming that the interference value is i 1. (b) Make the same calculation assuming an interference value of i 0.5. (c) Assume again that i = 1, and suppose that you cross a homozygous wild-type female to a v s f male and then mate the progeny among themselves. What are the possible classes of progeny and their expected numbers among 2000 progeny animals?

Explanation / Answer

5 a) distane beweeen vand s=10 probability of single cross over between v and s=P(sco)=10/100=0.1

distane beweeen f and s =14/100=0.14

p(double cross over)=0.1*0.14=0.014

expected number for progeny with sco between v and s=0.1*2000/100=2

expected number for progeny with sco between f and s=0.14*2000/100=0.28

expected number for progeny with dco =0.014*2000/100=0.028

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