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Genetic and Environmental Factors
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abnormal gene addition affected child affected children affected male amniocentesis associated autosomes babies balanced translocation biochemical birth carrier cause cent chromo chromosomal abnormalities common congenital abnormalities congenital heart consultands couples cousin deafness deficiency demonstrate discussion disorders doctor dominant dominantly inherited Down's Syndrome Down’s Duchenne Duchenne muscular dystrophy environmental enzyme examination family pedigree female fertilisation fetal fetoscopy fetus further children gametes genetic counselling genetic counselling clinic genetic disease genetic factors genetic nurse health visitor Huntington’s Chorea hydrocephalus important individual infant karyotype large number malities maternal meiosis meningomyelocele mental retardation mother multifactorial muscular dystrophy non-disjunction normal allele number of chromosomes obviously offspring parents patients pedigree information physical abnormalities possible pregnancy prenatal diagnosis problems produce protein recessive disease recessively inherited recognised recurrence risk referred result seen serious sex chromosomes sex-linked single gene situation sperm spina bifida technique tion trisomy 18 trisomy 21 Turner's Syndrome usually X chromosome