Question

2. You have an organism with 3 recessive genes that you are mapping, x, y, and z that are on the same chromosome. You cross a female heterozygous for all three traits in a test cross and obtain the following progeny. Progeny Number y + + 506 + + + 97 y + z 130 + XZ 513 ухг 83 y x + 16 I + x + 140 + + z 15 Total 1500 a. (13 points) What is the order of genes? Show your reasoning. b. (13 pints) How far apart are x and y? Show all work C. (13 points) How far apart are y and z? Show all work d. (13 points) How far apart are x and z? Show all work

Answer 1

dululion - Number 506 : 0 0 ... + + + ot orot 4 to . He Tut 140. + + 3 15 • Total 1500 Talking about povereto & Mosemburanta fermed ruchowe As we know that this is a three-point cules, therefore there will be a single crossing (forming single crees over (sco) product) & athetwill bel double peressing C Houming double cressons ouey (DCO) braduct). The Iro. of progeny for D.Co is always least, followed by s.c.o & then parents .. we can identify the parents, 8.00 £0.00 Progeny Number To 506 - Parents 97 .6.0 is the 130 . 513 - Parent 83 ---.S.C.O. AW 16 - D.C:0 *140' - S:com S .-D.C. D til + + 3 To To find the gene ander, we require the parent a o.col (that we have identified already). Costulare We will have to check the restangimeniti tifugleine that will give the combination of D.co combinato gene Enamble - Subbese we consider the Gene anderas xy 31 then the D.Co product of this arrange - ment must match that of quien in table! Ma 0 K73 ļ decan't match with ++ @ + y l l quien D.C.0 which is gol ynt 4+3. Now we will change the arrangement as, outy' ? matches the quùn DC:0 + + + ② + 3 + I combinations ! [ the arrangement doesn't matter, I combinations shouls as d be checked] Thus the gene order will be nzu au also written as yzon f@y @x? "Iz bung in mudelle (b) ♡ To find the distance between n& y. Facemula ley calculating distance between 2 gene [No. of s.c.6 + D.C-0] x 100 CM OLMU. D total prisgony - ③ Now eu Since we are considering I Now we know the cene order, we can calculate the diätänce blw x83,&4 [ Summing up the distance O к 0 L olu он ва за Quil give distance. F t t beturen i dy. to calculate distance blu xdag. Luky s.çowill be Tot udz]. 24 , we require 5-2.0 940.c0 - To find s...o + + + o quies a++ & value for this combination in table is 140. ques +34 & value for this lcombination in table is 4130. + + + D.C.O are already o identified , thus we will take these values directly ! Now we have S.CO = 140 +130 0.0.0 2 15+ 16 Total progeny - 1500 XY letting in Jerumur 140 + 180) (16+16)] x 100 = 7500 301 x 100 T5oo = 0.20 X 100 – 20.0 CM @ MU. 6 Similarly we can find the distance b/w 3&y, now we habe remaining s.c.o 83 +97 hivi o D.C.0 3 15.+ 16 lui Hris i Total bregeny = 1500 putting in formula L o Lo [183+97) +(15+16).] x 100 1500 211 x 100 = 1500 ! C ij llos Q0W - 140Mar MO. (6) Distance between udy will be sum of distance beturen nedz aneh zly - 20+14 - = 34 CM OY MU. Answers (a) Gene order = uzy ay could be written as Tb) Dist.blw nanely's 34CM. © Bolboo bo 12 - 1 чем (d) Distance blw udz 20CM Scanned with CamScanner