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An allele is dominant if it is expressed in

1. both homozygous and heterozygous states
2. second generation
3. heterozygous combination
4. homozygous combination

Correct answer: both homozygous and heterozygous states

Solution

A dominant allele is expressed whenever it is present, so it appears in both homozygous dominant and heterozygous individuals. That is why the correct choice is the one mentioning both states.

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