FMLY 1010 Lecture 17: Lecture 17

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Family Social Sciences
FMLY 1010
Christine A.Schippers

OD88729 More often found in African American infants 80 can survive to adulthood with proper treatment TaySachs disease common in Eastern European Jewish ancestry French Canadians Baby with TaySachs likely to be severely mentally delayed and blind Huntingtons disease dominant disorder, usually not diagnosed until adulthood, causes brain to deteriorate, affects psychological motor functions Blood test can identify Huntingtons gene Genes that cause sexlinked disorders found on X chromosome Most are caused by recessive genes o Redgreen colour blindness difficulty distinguishing between red and green when they are next to each other (recessive) o Hemophilia blood lacks chemical components to clot (almost unknown in girls) FragileX syndrome X chromosome with a fragile spot, causes developmental delay that becomes worse as child gets older Chromosomal Disorders Problems arise when a child is born with too many or too few chromosomes = chromosomal anomaly (chromosomal error) Trisomies Trisomy = condition in which a child has 3 copies of a specific autosome Trisomy 21 Down Syndrome intellectually delayed, distinctive facial features, health concerns (hypothyroidism, hearing loss, heart anomalies) o Greater risk for mothers over 35 Few children with trisomy 13 or 18 live past their first year Chances increase with birth mothers age (of disorder occurring) SexChromosome Anomalies Klinefelters syndrome XXY pattern, 1 or 21000 males, look normal but have underdeveloped testes, low sperm production as adults Most are not intellectually delayed o Many have languagelearning disabilities Experience both male and female puberty changes Turners syndrome single X, anatomically female, stunted growth, usually sterile Without hormone treatment, will not menstruate properly or develop breasts have serious heart anomalies, imbalance in cognitive skills Perform poorly on tests for spatial ability, above normal on verbal tests Neither of the above are associated with the mothers age Older mothers are more likely to produce normallooking girls with an extra X chromosome and boys with an extra Y
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