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Will my baby be born with congenital deafness?

The gene for congenital deafness are X-chromosomes linked.

1. If the father has congenital deafness and mother has normal hearing, the gene can not be passed to the male offspring since the father passes only the Y chromosome to the male offspring.

2. If the father has congenital deafness and mother has normal hearing, the female offspring will have one congenital deafness gene (from father) and one normal gene (from mother). A female with one congenital deafness gene and one normal gene will have normal hearing.

3. If the mother has congenital deafness, and father has normal hearing, there is 50% chance that the congenital deafness gene will be passed on to either the male or the female off spring.

4. If the mother has one congenital deafness gene and one normal gene, and father has normal hearing, there is 50% chance that the congenital deafness gene will be passed on to either the male or the female off spring.

The male offspring receiving the congenital deafness gene, will be deaf. The female off spring receiving congenital deafness gene from mother receives the normal gene from father. A female with one congenital deafness gene and one normal gene will have normal hearing.

5. A female with two congenital deafness genes, will be deaf.

6. A female with one congenital deafness gene and one normal gene will have normal hearing.

7. A male with one congenital deafness gene, will be deaf.