Question

16.) [16 pts Consider linked genes s, t, and u in an organism. The s, t, and u alleles are recessive to wild type. An Fl triple heterozygote for these genes is test-crossed. Testcross progeny are in the following phenotypic classes: p sutt + + + SU + 352 + u + ( U + 34 + 5 Sut (sl sut as + I SC S7+ 45 so she is 96 + + t S + t S + + + ut Total 45 79 1000 o suttt at Sャー a) Give the genotypes of the parentals and the Fl hybrid. (In the F1, be sure to show both chromosomes, and show which alleles are on which chromosome.) Parentals والا کا" I FI sutt Stutt b) Draw a linkage map, showing the gene order and distances between the genes. 7.8 pts Briefly describe one piece of evidence that supports the idea that the Y chromosome (or a region of the Y) determines maleness in humans. (1-2 sentences is sufficient.) )

Answer 1

Arbefall Sweeteners. A) Parentan sut x H + t = 343 are parents. The Parental has hisher number i + proseny. Here sut=352 Find order of Genes. I Double cross over (Do) are low number it proseny. +++=9 4 Sut it. 2. Take F cross between utt gives Do. The siven order is wons. 3. Intercharse utt. To get Correct order. stu onder a here is Is t u TË STEP 2 Reumbinon Fromas so btw s4 t + Do yoo a helweer & 4t - - Total Sco blu set are, 87+96+ 9 + 14 xbo tut=87 & St t=96 - 20.6cm STEP 3: BE how t4u - So blu ttu too un - Total s+t=45 4 tut=54 = 45+54 +9+ 14 kioo Todo = 12.2cm Rate this f GAPP එකෝre 12. 2cm 20.6cm - tu