english: Since females only have X's to pass on in their egg cells, and males can give either an X or a Y in their sperm cells, the sex is determined by the father and the chance of producing a male or a female is 50/50.
non_english: Kako žene imaju samo X hromozom u jajnim ćelijama, a muškarci mogu imati i X i Y u spermatozodima, otac je taj koji određuje pol deteta i šanse da će biti dečak ili devojčica su 50/50.