When a gene exists in more than one form, the different forms are called as

Heterozygous

Complementary genes

Genotypes

Alleles

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Alleles are the two copies of a gene which carries contrasting characters. The two alleles express two different phenotypes. The allele which shows its effect is known as dominant allele and those which are unable to express is known as a recessive allele.

So, the correct answer is option D.

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