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

AA , Aa

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TT, Tt

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Both A and B

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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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Which among the following statements is/are correct with respect to the law of dominance?

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B. In a dissimilar pair of factors one is dominant and the other is recessive.

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D. Explains the proportion of phenotypes, 3:1 obtained in $F_{2}$ generation.

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