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DNA - DNA carries the instructions for the formation and...

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DNA – carries the instructions for the formation and functioning of organisms Prenatal diagnostic techniques Amniocentesis – withdraw a small amount of amniotic fluid and test the fluid to see if the fetus is a carrier of certain genes Chorionic villi sampling – cells are withdraw from the chorionic villi that surround the amniotic sac Risks associated with prenatal screenings Amniocentesis o 14-16 th week of pregnancy o 1 in 200-300 women miscarry Chorionic sampling o 9-10 th week of pregnancy o Higher risk of miscarriage o Risk of limb deformities o Child’s genotype Child’s phenotype A child will not express every characteristic in its genetic makeup Alleles – different forms of genes Homozygous – similar forms of traits AA Heterozygous – different forms Aa Gene expression Dominance pattern - very few traits follow this simple pattern Polygenic pattern – traits are governed by the interaction of more
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