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50 percent abortion affected child amniocentesis amniotic fluid anencephaly associated babies biochemical disorders birth defects blood group blood pressure body born brain called cancer carrier cause Chapter chromo chromosomal abnormalities coronary couple death deficiency diabetes doctor donor Down's syndrome drugs early environmental enzyme example factors family history father fects female fertilized fetal fetus frequency genetic counseling genetic disease genetic disorders German measles harmful genes heart disease hemophilia hereditary disease hereditary disorders high blood hormones identical twins increased individuals infants infection inherited insemination kidney mental retardation mosome mother newborn nonidentical twins normal occur offspring ovum parents patients percent chance percent risk person physician possible preg pregnancy prenatal diagnosis prenatal studies problems protein recognized rubella schizophrenia serious sex chromosomes sex-linked sickle cell anemia simply skin specific sperm Tay-Sachs disease technique tion treatment tumors United urine virus woman womb women x-rays XYY males