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In a typical Mendelian test cross recombinant phenotypes make up: A. 25% of the offspring B....

In a typical Mendelian test cross recombinant phenotypes make up:

A. 25% of the offspring

B. 50% of the offspring

C. 75% of the offspring

D. 100% of the offspring

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Answer #1

A test cross is a cross between the organism in question with a phenotypically recessive individual( homozygous for the recessive trait).

  • If the organism in question is homozygous for the dominant trait then 100% of the offspring will be recombinants.

Parents AA * aa

F1 generation Aa Aa  

100 % recombinants

  • If the organism in question is heterozygous for the dominant trait then parental genotypes are observed.

Parents Aa * aa

F1 generation Aa : Aa : aa : aa

parental genotypes

So the answer to the question is in a typical Mendelian test cross recombinant phenotypes make up 100 % of the offsprings.

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