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Screenings, Karyotype and Pedigree Genetic Screenings 1. Blood Tests 2. Amniocentesis – amniotic fluid surrounding baby (in pregnant women) removed & analyzed in karyotype 3. Chorionic villi sampling – test tissue growing between uterus & placenta (make karyotype) Karyotype = picture of chr. in 1 cell, arranged in homologous pairs by size & shape • Detects mutations or missing/extra chr. for genetic disorders Detecting Human Genetic Disorders Pedigree = diagram showing how a trait is inherited over several generations Normal Male Male w/ condition Male CARRIER for condition Normal Female Female w/ condition Female CARRIER for condition ½ colored in Carrier = Person has 1 copy of a recessive allele • usually HETEROZYGOUS • don’t show/express trait but can pass it to offspring • males can never be carriers for X-linked disorders
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