He was hiding the fact that he was an illegitimate child.

I'm sorry, but I don't speak Japanese.

I'm a Muslim, so I fast during Ramadan.

I'm Jewish.

In our medical class, we learned about the function of the pyramidal tract.

He is dedicated to the study of autosomes.

Their teamwork was in complete harmony, and it was beautiful.

He is good at reading traditional Chinese characters.

The Y chromosome carries the genes that determine maleness.

I inherited my X chromosome from my mother.