sex-chromosome theory

例句：

1. 1. Thesex-chromosome theory has been a subject of much debate in the field of genetics.
   性别染色体理论一直是遗传学领域争论的焦点。
2. 2. This theory suggests that genes are responsible for determining an individual's sex.
   这一理论认为，基因决定了个体的性别。
3. 3. The sex-chromosome theory has been challenged by recent research showing that environmental factors also play a role in determining gender.
   近期研究表明，环境因素也会影响性别的决定，这挑战了性别染色体理论。