The $F_{2}$ offspring of a monohybrid cross would show the genotype ______.

AA and Aa

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Aa and aa

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AA, Aa and aa

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Aa only

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Solution

The correct option is C AA, Aa and aa
F1 AA x aa the progeny would be Aa and all would show the dominant phenotype.
F2 On selfing the F1 progeny the cross would be Aa x Aa. If you draw a punnet square for this cross you would get a ratio of 1:2:1 Homozygous dominant: 2(Heterozygous dominant): Homozygous recessive which will be AA: 2(Aa): aa
So, the correct answer is 'AA, Aa, and aa'.

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