Question

У человека ген, вызывающий одну из форм наследственной глухонемоты, рецессивен по отношению к гену нормального слуха. От брака нормальных по слуху мужчины и женщины, родился глухонемой мальчик и две нормальные по слуху девочки. определите генотипы родителей и детей.

Answer 1

Генотип родителей:отец XaY мать XAXa

Answer 2

Gene and Inheritance of Deaf-Mutism

The gene causing one form of hereditary deaf-mutism is recessive in relation to the gene for normal hearing. From the marriage of a man and a woman with normal hearing, a deaf-mute boy and two girls with normal hearing were born. Let's determine the genotypes of the parents and the children.

Genotypes: The gene for normal hearing is represented by the symbol "N", and the gene causing deaf-mutism is represented by the symbol "n".

- The father's genotype: NN - The mother's genotype: NN - The deaf-mute boy's genotype: nn - The two normal-hearing girls' genotypes: NN

This means that both parents are carriers of the gene for deaf-mutism, but they themselves have normal hearing. The deaf-mute boy inherited the recessive gene for deaf-mutism from both parents, resulting in his condition. The two normal-hearing girls inherited the dominant gene for normal hearing from both parents.

This genetic inheritance pattern aligns with the principles of Mendelian genetics, where the trait for normal hearing is dominant (N) and the trait for deaf-mutism is recessive (n).

This understanding of genetic inheritance can help in predicting the likelihood of certain traits or conditions being passed on to offspring in similar scenarios.