pregnant women 35 years of age , women who previously had a chromosomally abnormal child , families with translocation carriers or other heritable chromosomal disease , families where the father was 50 years or more and women in families with a history of down 's syndrome ( group a ) , were compared to women having amniocentesis , although considered not to have any increased risk of fetal chromosome abnormality ( 1390 pregnancies , group b ) .
C0040715
translocation
C0008626
of