3: Sex linkage
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- 3.1: Example punnet square for sex-linked recessive trait
- Example punnet square for sex-linked recessive trait.
- 3.2: X-linked inheritance
- Chromosomal basis of sex determination. X and Y chromosomes, X-linkage.
- 3.3: X-inactivation
- How XX human females (and other female mammals) shut down one of their X chromosomes in each cell. Disorders of sex chromosome number: Klinefelter, triple X, and Turner syndromes.
Thumbnail: Tortoiseshell cat. (Public domain; Michael Bodega via Wikimedia Commons).