Question

16. Describe sex determination in humans.

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Answer 1

Human beings have XX_XY sex determination system. In this, the males have XY sex chromosomes. They produce two types of gametes having X and Y chromosome. The females have XX chromosome. They produce only one type of gamete having X chromosome. The sex of a child is determined by the type of chromosome he/she receiving from the father. If sperm is having X chromosome, then the child will be a girl. If sperm is having Y chromosome, then the chilld will be a boy. The Y chromosome carries factors responsible for triggering male development. The X chromosome carries factors responsible for triggering female development.

Answer 2

In humans, biological sex is determined by five factors present at birth: the presence or absence of a Y chromosome, the type of gonads, the sex hormones, the internal genitalia (such as the uterus in females), and the external genitalia. ... The precursor of the internal female sex organs is called the Müllerian system.