Question

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

• A. Epistasis genes
• B. Holandric genes
• C. Operator genes
• D. Antiepistasis genes

Answer 1

Answer: (A)

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].
${}^{\ast }$ Genes which are located on X-chromosome only are called hologynic genes and those found on Y-chromosome only are called holandric genes.