Aneuploidy

Types

One less chromosome (2n - 1)

Often lethal

[!abstract] Turner syndrome: X0, phenotypically female, sterile

One more chromosome (2n + 1)

Often harmful

[!example] Down syndrome (trisomy 21): 3 21^th chromosomes

[!example] Klinefelter syndrome: XXY, often sterile, small testicles

[!example] XYY syndrome: no syndrome

[!example] Trisomy X: XXX, mostly no syndrome

Don't look up trisomy 13...

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