2. A trihybrid individual heterozygous for three corn seed traits is testcrossed. Â Â Â Â Â Â Â Parents: CCssWW (CsW/CsW)Â Â Â Â Â Â Â XÂ Â Â Â Â Â Â ccSSww (cSw/cSw) Â Â Â Â Â Â Â Trihybrid: CcSsWs (CsW/cSw)Â Â Â Â Â Â Â Â Â XÂ Â Â Â Â Â Â ccssww (csw/csw) Test cross offspring Seed trait Gamete from trihybrid Number Red,...

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Biology

2. A trihybridindividual heterozygous for three corn seed traits istestcrossed.
Â Â Â Â Â Â Â Parents: CCssWW(CsW/CsW)Â Â Â Â Â Â Â XÂ Â Â Â Â Â Â ccSSww(cSw/cSw)
Â Â Â Â Â Â Â Trihybrid: CcSsWs(CsW/cSw)Â Â Â Â Â Â Â Â Â XÂ Â Â Â Â Â Â ccssww(csw/csw)
Test crossoffspring
Seed trait
Gamete fromtrihybrid
Number
Red, shrunken,normal
CsW
2777
White, plump, waxy
cSw
2708
Red, 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 ofprogeny:
7000
a) Identify parental,SCO (single crossover) and DCO (double crossover) classes
b) Determine the geneorder
c) Calculate the mapdistance for each gene interval

Answer & Explanation Solved by verified expert

3.7 Ratings (358 Votes)

Analyses Given corn has three loci under observation ie C stands for seed colour Red dominant and white recessive S stands for seed shape Plump dominant and shrunken recessive and W stands for seed coating Normal dominant and waxy recessive controlling loci Given trihybrid cross is CsWcSw X cswcsw parental combination will be CsW and cSw the respective offspring no is 2777 and 2708 while some recombinant offspring will also be produced due to the cross over CO See Answer

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Â Â Â Â Â Â Â Parents: CCssWW(CsW/CsW)Â Â Â Â Â Â Â XÂ Â Â Â Â Â Â ccSSww(cSw/cSw)
Â Â Â Â Â Â Â Trihybrid: CcSsWs(CsW/cSw)Â Â Â Â Â Â Â Â Â XÂ Â Â Â Â Â Â ccssww(csw/csw)

Test crossoffspring

Seed trait	Gamete fromtrihybrid	Number

Red, shrunken,normal	CsW	2777
White, plump, waxy	cSw	2708
Red, 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 ofprogeny:		7000