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Question

Dominant character is represented by a capital letter and recessive by small letter. Which of the following alleleic pairs are possible in F1 generation ?


A

AA , Aa

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B

TT, Tt

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C

Both A and B

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D

aa , tt

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Solution

The correct options are
A

AA , Aa


B

TT, Tt


Dominant alleles represented by capital letter expresses itself in both, homozygous condition (AA, TT ) or heterozygous condition ( Aa, Tt ) in F1 generation. Recessive traits express only in the F2 generation ( in case of Monohybrid / Dihybrid cross ) i.e when they are in homozygous condition (aa, tt).


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