2nd October 2019


What does it mean if you have an extra chromosome?

Most fetuses with trisomy are miscarried during the first trimester. Most of those who survive have Down syndrome, also known as trisomy 21 because it's caused by an extra chromosome 21. While all babies with Down syndrome have some degree of mental impairment, it's severe in only about 10 percent.

Can a girl have Klinefelter's syndrome?

Klinefelter syndrome affects males only; females cannot have it. Klinefelter syndrome results from a genetic abnormality in which males have an extra copy of the X chromosome. Instead of the usual XY chromosomes, males with Klinefelter syndrome have an XXY pattern.

What are the most common chromosomal disorders?

Numerical abnormalities
Down'sTrisomy 2115 in 10,000
Edwards'Trisomy 183 in 10,000
Patau'sTrisomy 132 in 10,000
TurnerMonosomy X2 in 10,000 (female births)
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