Write Short Note on :Y-linked or Holandric genes.

1.	Write Short Note on :Y-linked or Holandric genes.
Answer» 1. Holandric means entirely of male sex. Y-linked genes are called holandric genes because they are located on non-homologous region of Y chromosome. 2. The Y-linked genes are inherited directly from male to male. 3. These genes are never seen in females due to lack of Y chromosome in them. 4. Hyper Mchosis and ichthyosis are examples of holandric genes. 5. Hypertrichosis means excessive development of hair on pinna of ear. This character is transmitted directly from father to son. 6. Ichthyosis person with rough skin.

Answer»

1. Holandric means entirely of male sex. Y-linked genes are called holandric genes because they are located on non-homologous region of Y chromosome.

2. The Y-linked genes are inherited directly from male to male.

3. These genes are never seen in females due to lack of Y chromosome in them.

4. Hyper Mchosis and ichthyosis are examples of holandric genes.

5. Hypertrichosis means excessive development of hair on pinna of ear. This character is transmitted directly from father to son.

6. Ichthyosis person with rough skin.

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