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Anomaly of sex chromosome
- ... result of a gene defect on the X chromosome . The disorder affects only girls.
- ... diseases Mental abilities Natural talents An abnormal trait ... seek prenatal diagnosis if one of them has a genetic disorder.
- ... or less developed than normal for the baby's sex and gestational age. Gestational age is the age of a fetus or baby that starts on the first day of the mother's last menstrual period.