Question

2. A wild-type strain of flies was crossed to another strain homozygous for the recessive X-linked mutants m, r, and v. The F1 females were backcrossed to recessive strain males, and the following nmbers of progeny were observed: +++ 331 m++ 2 +r+ 73 ++ v 14 Ya lle sd oubo mr+ 10 m + v 81 +r v 0 mrv 309 on Total 820 a) What is the gene order and the map distance between these mutants? to bo Seatots od bou sla odo onyion b b) What is the coefficient of coincidence and the value of interference for this cross (show your work)? b6 ong doid (

Answer 1

331 ? Parental urt 31 tis? 22 Dco 2) According to the observed number of phenohbe (by observing Dco repton) a it is easier to fold order of gene is ramy or Romov. Now, Genotype observe no POR OSS ROSS- + + + + + + Tmv 309 J + mv SI 2 scoat 73 resious ++v 14 1 scoot mm + D.CO 10 Jmerou 11 m + I barrental rtv . Recombinant E: 820 Se parental Distance bo mema SC81+73)+(2+)XICO Y. - 19% Csco 'restou I) $20 ! av 190M Distance mw mer = {(14+10)+(2+0), xray, 3% or 3CM Gabb.). Scorepi ou 1) Total map distance 3,19 y. (81473):4 64118)42 (2+0)x1404. – 22:17 07 22.1014. Ma. = 1900 27414 CNPT IN SCHALE) - 22:10 © Coebbicient of coincidence CC.C.) 140x10DY. +0.24% or 0-24 Interference (1) (-00) EC-0.24) er 0.676