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Syndrome occurs in 1 out of every 800 live births i

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Unformatted text preview: n 1 out of every 800 live births. i Older women have a higher risk. i In 95% of all cases there are three copies of the 21st chromosome: trisomy 21. i Extra chromosome alters course of development and causes physical and mental characteristics. Genetic and Chromosomal Abnormalities Temple Odom, PhD MSU 3 FCE 225 Prenatal Development i Germinal Embryonic Period i From period: from conception to second week. i Characterized by growth of zygote and establishment of linkage between zygote and support system of mother. end of second week to eighth week growth i Establishment of a placental relationship with mother i Early structural appearance of all chief organs i Development of recognizable human body i Rapid Development During Embryonic Period i i i Cephalocaudal Proximodistal Critical Period Fetal Period i Begins The Timing of Birth Determined by the biochemical changes in - mothe...
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