why?? 19 7. There is 15% percent recombination between genes A and B There is 11
ID: 134690 • Letter: W
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why??
19 7. There is 15% percent recombination between genes A and B There is 11% percent recombination between genes A and D. There is 24% percent recombination between genes B and D. The order of these genes is most likely A. A-B-D B. A-D-B C. D-B-A D. B-A-D E. The three genes are clearly on different chromosomes 8. The cross ab/ab x AB/ab is performed. If the two genes in question are completely linked, the progeny will have the genotypes AaBb Aabb: aaBb : aabb in the ratio... A. E. 9:3:3:1 9. The cross ab/a b x Ab/aB is performed. If the two genes in question are completely linked, the progeny will have the genotypes AaBb :Aabb: aaBb : aabb in the ratio...Explanation / Answer
7.
D----11%--A------15%-----B
D----------24%-----------B
Direct distance between D and B is always lesser than
three cross map.
8. it is completely linked so no crossing over occurs.
Crossing over = 0
This is test cross so make a gametes,
AB and ab X ab
AB X ab = AaBb
ab X ab = aabb
So. AaBb : Aabb : aaBb : aabb
1 : 0 : 0 : 1
9. Same like 8.
Crossing over = 0
This is test cross so make a gametes,
Parents is heterozygous Ab/aB X ab
Ab and aB X ab
So, Ab X ab = Aabb
aB X ab = aaBb
AaBb : Aabb : aaBb : aabb
0 : 1 : 1 : 0
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