external characteristics; it is also possible they could have both male and female characteristics. This disorder is called androgen insensitivity syndrome.
In short, biological sex is complicated. Sex determination is due to chromosomes and the genes found on them, the gonads (sex organs), genitalia, and physical characteristics present, as well as affected by chemicals, like hormones, and other environmental factors.
3.1 Why can an individual survive without a Y chromosome but not without a X chromosome?
3.2 What is the SRY gene, and what is its function in sex determination?
3.3 Discuss why knowing an individual is XX or XY in terms of chromosomes is not sufficient to know their biological sex.
3.4 Define intersex.
