Three corn seed traits are C for red, c for white; S for plump, s for shrunken; W for normal, w for waxy. Use the data from the testcross to map the distances and order of these three loci. Show calculations and illustrate the gene map. (Hint: drawing out the chromosomes and gametes will help.) Parents: CCssWW (CsW/CsW) X ccSSww (cSw/cSw) Trihybrid: CcSsWw (CsW/cSw) X ccssww (csw/csw) Test cross offspring Seed trait Gamete from
Three corn seed traits are C for red, c for white; S for plump, s for shrunken; W for normal, w for waxy. Use the data from the testcross to map the distances and order of these three loci. Show calculations and illustrate the gene map. (Hint: drawing out the chromosomes and gametes will help.)
Parents: CCssWW (CsW/CsW) X ccSSww (cSw/cSw)
Trihybrid: CcSsWw (CsW/cSw) X ccssww (csw/csw)
Test cross offspring
Seed trait |
Gamete from trihybrid |
Number |
Red, shrunken, normal |
CsW |
2777 |
White, plump, waxy |
cSw |
2708 |
R ed, plump, waxy |
CSw |
116 |
White, shrunken, normal |
csW |
123 |
Red, shrunken, waxy |
Csw |
643 |
White, plump, normal |
cSW |
626 |
Red, plump, normal |
CSW |
4 |
White, shrunken, waxy |
csw |
3 |
Total number of progeny: |
|
7000 |
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