The condition in which only one allele of a pair is present in a diploid organism is known as

Homozygous

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Heterozygous

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Hemizygous

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Incomplete dominance

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Solution

The correct option is C Hemizygous
Hemizygous is a condition of having only a single copy of a gene instead of the customary two copies. All the genes on the single X chromosome in the male are hemizygous. Homozygous is a condition of having identical pairs of genes for any given pair of hereditary characteristics. Heterozygous is a condition of having different genes for any given pair of hereditary characteristics. Incomplete dominance refers to a genetic situation in which one allele does not completely dominate another allele, and results in a new phenotype.
Thus, the correct answer is option C.

Suggest Corrections

	I		II
(a)	Dominance	(i)	Many genes govern a single character
(b)	Codominance	(ii)	In a heterozygous organism only one allele expresses itself
(c)	Pleiotropy	(iii)	In a heterozygous organism both alleles express themselves fully
(d)	Polygenic inheritance	(iv)	A single gene influences many characters.

Column I	Column II
(a) Dominance	(i) Many genes govern a single character
(b) Codominance	(ii) In a heterozygous organism only one allele expresses itself
(c) Pleiotropy	(iii) In a heterozygous organism both alleles expresses themselves fully
(d) Polygenic inheritance	(iv) A single gene influences many characters