Question

In: Biology

In a test cross of a double heterozygote, each of the recombinant type gametes occurs at...

In a test cross of a double heterozygote, each of the recombinant type gametes occurs at a frequency of 15%. The expected frequency of each of the parental type gametes is

a) 15% b) 20% c) 35% d) 45% e) 50%

Expert Solution

Ans:

C) 35%

Explanation:

double heterozygote test cross is given as under

Phenotypes Tall Round x Dwarf wrinkled

Genotypes TTRR x ttrr

Gametes TR, Tr, tR, tr tr

Genotypes and phenotypes of F2 population

	TR (35%)	Tr (15%)	tR (15%)	tr (35%)
tr	TtRr	Ttrr	ttRr	ttrr

Phenotypes Tall Round Tall wrinkled dwarf Round dwarf wrinkled

Since frequency of each recombinant gametes = 15%

Recombinant gametes = Tr and tR

Therefore frequency of recombinant gametes is given under

Tr = 15%

tR = 15%

Parental gametes = TR and tr

Therefore frequency of parental gametes is given under

TR= 35%

Tr =35%

gladiator answered 2 years ago

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