Learn about prenatal testing for chromosomal abnormalities.

了解产前检测染色体异常检测。

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Doctors extract a cell from an embryo and test it for chromosomal abnormalities.

医生从胚胎中取出一个细胞，并且检测这个细胞是否有染色体遗传。

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Such chromosomal abnormalities inactivate tumor - suppressor genes that are critical for controlling cell growth.

这种染色体异常使控制细胞生长的关键肿瘤抑制基因失活。

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Once an older woman does become pregnant, she runs a greater risk of miscarriage, foetal and chromosomal abnormalities, and pregnancy-related diseases.

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The biological reasons for why this may be are unclear, but the researchers speculated that potential chromosomal abnormalities in the eggs of older women and mutations in the sperm of older men may be a factor.

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Egg abnormalities also usually involve larger chromosomal changes, and are therefore easier to test for.

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