JAMB - Biology (2001 - No. 37)
The probability of a baby being a boy or a girl depends on the contribution of the
father's sex cell
father's somatic chromosome
mother's sex cell
mother's X-chromosome
Explication
The probability of a baby being a boy or a girl depends on the father's sex cells because sperm cells can have either an X or a Y chromosome, while eggs always have an X chromosome.