Chapter 2 - Prenatal Development Chapter 2 Prenatal...

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Chapter 2 Prenatal Development
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Prenatal Development Trimesters: pregnancy divided into three, 3-month segments 1st = conception to about 13 weeks 2nd = 13 weeks to just over 25 weeks 3rd = 25 weeks to birth (birth ~38 weeks) Prenatal Stages Germinal stage Embryonic stage Fetal stage 2
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Prenatal Testing (table 2-2, p. 53) Ultrasound sonography high freq sound waves Structural abnormalities (size, shape) Uterine abnormalities First-trimester screen: 11-13 wks Blood test and ultrasound sonography Checks chromosomal abnormalities and other disorders 4
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Prenatal Testing (continued) 5 Chorionic Villus sampling (CVS): 8-11 wks If abnormal screen/familial history Tissue removed from placenta and tested Amniocentesis: 15-20 wks Sample of amniotic fluid, Recommended if familial history
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Gregor Mendel (mid-1800s) Genotype vs. phenotype Polygenetic traits 6
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Chapter 2 - Prenatal Development Chapter 2 Prenatal...

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