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Old 10-01-2011
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DNA How would you describe XYY

Chromosomal analysis reveals a 47,XYY karyotype. Which of the following descriptions best fits this abnormality?
A. Autosomal trisomy
B. A male with Klinefelter's syndrome
C. Sex chromosome aneuploidy
D. A female with Turner's syndrome
E. Sex chromosome triploidy
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Old 10-01-2011
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I think it is C
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Old 10-02-2011
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The answer is: C
The 47,XYY karyotype is an example of sex chromosome aneuploidy, as are Klinefelter's syndrome (47,XXY), Turner's syndrome (45,X), and triple X syndrome (47,XXX). Sex chromosome mixoploidy implies mosaicism, such as 45,X/46,XX with two cell lines in one individual. Autosomal trisomies include Down's syndrome [47,XX+21 (trisomy 21)], Patau's syndrome [47,XX+13 (trisomy 13)], and Edwards' syndrome [47,XY+18 (trisomy
18)].
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