When an allele fails to express itself in presence of the other allele, the former is said to be

Recessive

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Dominant

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Codominant

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Complementary

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Solution

The correct option is D Recessive
Recessive alleles are the alleles which can express their character only when present in homozygous condition.

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An allele which decides the appearance of an organism only in the presence of another identical allele is called a recessive allele.

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