sex chromosome

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How is biological sex determined?

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July, 2006, Launch of Space Shuttle Discovery STS-121. See attached for full caption information.

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Small, white rat (genus Rattus) on a glass table. (rodent, laboratory, experiment)

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Hemp (Cannabis sativa).

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illustration of the walking titanosaurus, Patagotitan mayorum

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Lusitania sinking, illustration from The War of the Nations (New York), December 31, 1919. World War I, WWI. This image is one of three on the page. (See source file for the other two.)

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Abundance of key immune cells may be influenced by estrogen and XX chromosomes • Mar. 26, 2025, 12:41 AM ET (Medical Xpress)

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How is biological sex determined?

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Topics

X chromosome Y chromosome Barr body androgen insensitivity syndrome Klinefelter syndrome Turner syndrome XYY-trisomy trisomy X superfemale sex sexual differentiation karyotype autosome sexual dimorphism unisexuality sex hormone bisexuality gene major histocompatibility complex telomere

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Key People

Stevens, Nettie

Nettie Stevens

American biologist and geneticist

Clarence E. McClung

American zoologist