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A gene is said to be dominant if

1. it expresses its effect only in homozygous state
2. it expresses its effect only in heterozygous condition
3. it expresses its effect both in homozygous and heterozygous condition
4. it never expresses its effect in any conditions

Correct answer: it expresses its effect both in homozygous and heterozygous condition

Solution

A dominant gene/allele produces its visible effect when present in just one copy, so it appears in both heterozygous and homozygous dominant conditions. A recessive allele needs two copies to be expressed.

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