the genes which remain confined to differential region ofY-chromaosome are holandric genes autosomal genes completely sex -linked genes mutant genes

The genes which remain confined to differential region of Y-chromosome are (1) 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 c'some)
• Y-linked (located on the differential region of the Y c'some).