Question

Genes located on differential region of Y-chromosome are called

• A. XY linked genes
• B. Holandric genes
• C. Autosomal genes
• D. Mutant genes

Answer 1

The correct option is B Holandric genes

The genes which remain confined to differential region of Y-chromosome are Holandric genes. Most of the X and Y are not homologous, however, and undergo NO CROSSING OVER. Traits coded on this DIFFERENTIAL regions of the X and Y exhibit inheritance patterns that are quite different from those shown by autosomal genes, and may be

X-linked (located on the differential region of the X chromosome)

Y-linked (located on the differential region of the Y chromosome).

Y-linked traits, which exist only in males, are known as Holandric traits. Under normal circumstances, females never express them.

So, the correct answer is 'Holandric genes'.