Class 10 Science Biology Heredity and Evolution
When a gene exists in more than one form, the different forms are called as
(a)
Heterozygous
(b)
Complementary genes
(c)
Genotypes
(d)
Alleles
Correct answer: (d) 
Solution: 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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