Question:

Holandric genes are located

Updated On: Jul 27, 2022
  • both in X and Y-chromosome
  • only in Y-chromosome
  • only in X-chromosome
  • only in autosomes
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The Correct Option is B

Solution and Explanation

Holandric genes are the $Y$-linked genes. The $Y$-linked type sex-linked inheritance is performed by those genes which are localised in the non-homologous sections of $Y$-chromosome and that have no alleles in $X$-chromosome.
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Concepts Used:

Non-Mendelian Genetics

The term - non-mendelian inheritance refers to any pattern of heredity in which features do not separate according to Mendel's laws. These principles describe how features linked with single genes on chromosomes in the nucleus are passed down through generations.

Types of Non-Mendelian Inheritance

Codominance Inheritance

It is a form of incomplete dominance in which both alleles for the same feature are expressed in the heterozygote at the same time. For example, the MN blood types of humans.

Incomplete Dominance

In a heterozygote, the dominant allele does not always completely cover the phenotypic expression of the recessive gene, resulting in an intermediate phenotype which is referred to as "incomplete dominance”.