in a corn Colored kernels (C) is dominant over colorless (c) Plump kernels (S) i
ID: 61576 • Letter: I
Question
in a corn Colored kernels (C) is dominant over colorless (c) Plump kernels (S) is dominant over shrunken (s) Starchy kernels (W) is dominant over waxy (w). A trihybrid (Cc Ss Ww) plant is testcrossed and the following progeny are obtained: 2708 Colorless, plump, waxy 2538 Colored, shrunken, starchy 626 Colorless, plump, starchy 601 Colored, shrunken, waxy 116 Colorless, shrunken, starchy 113 Colored, plump, waxy 4Colored, plump, starchy 4 Colorless, shrunken, waxy Determine linkage (including map distance) for the genes and gene order for this cross. in a corn Colored kernels (C) is dominant over colorless (c) Plump kernels (S) is dominant over shrunken (s) Starchy kernels (W) is dominant over waxy (w). A trihybrid (Cc Ss Ww) plant is testcrossed and the following progeny are obtained: 2708 Colorless, plump, waxy 2538 Colored, shrunken, starchy 626 Colorless, plump, starchy 601 Colored, shrunken, waxy 116 Colorless, shrunken, starchy 113 Colored, plump, waxy 4Colored, plump, starchy 4 Colorless, shrunken, waxy Determine linkage (including map distance) for the genes and gene order for this cross. in a corn Colored kernels (C) is dominant over colorless (c) Plump kernels (S) is dominant over shrunken (s) Starchy kernels (W) is dominant over waxy (w). A trihybrid (Cc Ss Ww) plant is testcrossed and the following progeny are obtained: 2708 Colorless, plump, waxy 2538 Colored, shrunken, starchy 626 Colorless, plump, starchy 601 Colored, shrunken, waxy 116 Colorless, shrunken, starchy 113 Colored, plump, waxy 4Colored, plump, starchy 4 Colorless, shrunken, waxy Determine linkage (including map distance) for the genes and gene order for this cross.Explanation / Answer
Trihybrid cross
S. No.
Genotype
Number
Progeny type
1
cSw
2708
parental
2
CsW
2538
parental
3
cSW
626
Single cross over between C and S
4
Csw
601
Single cross over
Between C and S
5
csW
116
Single cross over between S and W
6
CSw
113
Single cross over between S and W
7
CSW
4
Double crossover
8
csw
4
Double crossover
From the trihybrid cross, we can say that these genes are in the order of C/c, S/s and W/w.
Distance between C and S loci = (4+ 626+601 +4/ 6710)* 100 = 50 = 18.4 m.u.
The gene distance between S and W loci is = (4+116+113+4/ 6710) *100 = 3.53 m.u.
Now, the distance between C and W loci = 18.4 + 3.53 = 21.9 map units
S. No.
Genotype
Number
Progeny type
1
cSw
2708
parental
2
CsW
2538
parental
3
cSW
626
Single cross over between C and S
4
Csw
601
Single cross over
Between C and S
5
csW
116
Single cross over between S and W
6
CSw
113
Single cross over between S and W
7
CSW
4
Double crossover
8
csw
4
Double crossover
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