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The inheritance of biological sex and sex-linked genetic disorders

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I can explain how the inheritance of chromosomes determines biological sex in humans, and the inheritance of sex-linked genetic disorders.

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During sexual reproduction, an individual’s biological sex is determined by the chromosomes they inherit. In humans, the 23rd pair of chromosomes are sex chromosomes; XX in females and XY in males. A gene on the Y chromosome triggers the development of testes, which make male sex hormones (androgens). Interpreting, completing and constructing Punnett squares showing the inheritance of human sex chromosomes. Some disorders are caused by alleles on the sex chromosomes, so have sex-linked inheritance.

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