ANTH 101 Lecture Notes - Lecture 5: Cystic Fibrosis, Down Syndrome, Macroevolution
Document Summary
Microevolution evolution that occurs over short timescales for a given species within a few generations. Macroevolution evolution that occurs over long time periods and results in new species. Species a reproductive community of populations that are reproductively isolated from others. Prenatal screening tests for genetic disorders: trisomy 21 or down syndrome, klinefelter syndrome, cystic fibrosis genetic disease caused by a recessive c allele with the cf mutation. Both parents are carriers of the c allele. Carrier parent has only one recessive allele that codes for a disease. 25% chance each child will by unaffected with cystic fibrosis (cc) 50% chance each child will by a carrier of cystic fibrosis (cc) 25% chance each child will be affected with cystic fibrosis (cc) Gene flow the movement of genes among groups due to a sudden expansion or migration. Genetic drift random changes in gene frequencies from one generation to the next through isolation or sudden reduction in size.
