人分成两种——男人和女人。好吧,你大概已经知道这个了。不过,你是否知道,你是男是女的那个重大问题早在你出生之前就已经决定好了?作出这个决定的就是染色体。如果你是男孩,你就会有一个从爸爸那里得到的Y染色体和一个从妈妈那里得到的X染色体。如果你是女孩,你就会有两个X染色体——一个来自爸爸,一个来自妈妈。 People are divided into two types - men and women. Well, you probably already know this. However, do you know that the major issue that you are male or female has already been decided well before you were born? The chromosome is the one that makes this decision. If you are a boy, you have a Y chromosome from your father and an X chromosome from your mother. If you are a girl, you have two X chromosomes - one from a father and one from a mother.