28.02.2013 Views

The Principles of Clinical Cytogenetics - Extra Materials - Springer

The Principles of Clinical Cytogenetics - Extra Materials - Springer

The Principles of Clinical Cytogenetics - Extra Materials - Springer

SHOW MORE
SHOW LESS

You also want an ePaper? Increase the reach of your titles

YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.

Human Chromosome Nomenclature 35<br />

Fig. 5. (continued)<br />

Numerical Abnormalities Involving the Sex Chromosomes<br />

<strong>The</strong>se can be constitutional (congenital) or acquired. ISCN 2005 provides special ways to distinguish<br />

between the two. As shown in the examples below, the + and—signs are not needed to designate<br />

constitutional sex chromosome aneuploidies.<br />

Constitutional Sex Chromosome Aneuploidies<br />

45,X Classical monosomy X or Turner syndrome<br />

47,XXY Classical Klinefelter syndrome<br />

47,XXX A female with three X chromosomes<br />

48,XXYY Variant <strong>of</strong> Klinefelter syndrome with two X and two Y chromosomes

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!