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Unformatted text preview: male cat is calico. 15 Check out
16 Sex Chromosome Aneuploidy
XXX- normal, fertile female
XO – Turner syndrome - abnormal, infertile
XXY- Klinefelter syndrome - abnormal,
XYY- normal, fertile male
OY - lethal
y barely has any genes on it, so Xyy is barely aﬀected 17 Sex Chromosome Aneuploidy
XO-Turner syndrome: 1 in ~2500 female births Turner’s females - every cell in their
body is XO - lethal.
- females that survive only have a
portion of their cells as XO
problems at mitosis, not meiosis. 18 Sex Chromosome Aneuploidy
1 in 500 male births
(including XXYY etc) completely viable - nondisjunction events in meiosis
problem - all of the genes of the second X are turned oﬀ,
except one near the telomere and one near the centromere.
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This document was uploaded on 02/25/2014.
- Winter '14