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  4. Genes which are located only in the X-Chromosome are known as

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Q. Genes which are located only in the X-Chromosome are known as

WBJEEWBJEE 2014Principles of Inheritance and Variation

Solution:

Epistasis genes is the most probable option though none of the options seem appropriate. [According to Barr Body concept (applicable only for X-chromosomes ) genes present on the Barr body (inactive X-chromosome) are at times hypostatic due to presence of epistatic genes on the active X-chromosome].
$^*$ Genes which are located on X-chromosome only are called hologynic genes and those found on Y-chromosome only are called holandric genes.