GEV 1050 Lecture Notes - Lecture 7: Cladogenesis, Genetic Drift, Genetic Variation

• School: Villanova University
• Department: Geography and the Environment
• Course: GEV 1050
• Professor: Weston

Document Summary

Darwin and his journey on the beagle: finches exemplify variation associated with natural selection 1859 publishes origin of species. Cockroaches: broad diet, 10 million offspring in 1 year, resilience (freeze and survive) Descent with modification: common ancestors seen in bone structure: 1 2 many (similar structures in fossils demonstrate relationships) (cid:862)la(cid:373)a(cid:396)k (cid:373)issed the (cid:373)a(cid:396)k(cid:863) not ac(cid:395)ui(cid:396)ed cha(cid:396)acte(cid:396)istics. Genetic drift: changes in gene frequency in population by chance (small. Clicker question: in relation to natural selection, evolution is the outcome population size: (cid:862)(cid:373)echa(cid:374)is(cid:373)s of (cid:374)atu(cid:396)al selectio(cid:374)(cid:863) Gregor johann mendel (1822-1884: pea plants (hybridization) father of modern genetics, dominant/recessive alleles. 20-25k genes within different allele forms, 3 billion pairs, 46 full chromosomes. =complete set of genetics genome per person catg. Genotype: specific genetic makeup of an organism, the specific alleles that an organism carried. Phenotype: the observable physical traits in the form of behavior/appearance (how genes show up: homozygous and heterozygous, dominant or recessive. Q and p are frequencies of the allele.