sex chromosome

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How is biological sex determined?

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X chromosome Y chromosome Barr body superfemale Klinefelter syndrome androgen insensitivity syndrome Turner syndrome trisomy X XYY-trisomy sex sexual differentiation karyotype autosome sexual dimorphism sex hormone unisexuality 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