L48 Anthro 3283 Lecture Notes - The Extended Phenotype, Cowbird, Rh Blood Group System
Document Summary
Biological evolution: change in gene frequency in a population overtime: what changes gene frequency overtime, 1. Mutation for every million genes that is copied, 1-10 mutations occur: 2. Mechanism of inheritance, a coin flip that determines which genes get passed on to your offspring. Makes populations more dislike each other: 3. Gene flow change in gene frequency by combining/interbreeding of different gene pools. Natural selection changes in a population due to levels of fitness and ability to. Natural selection survive: selection against recessive homozygotes: albinism, lack melanin, selection against dominant homozygotes: achondroplasia (dwarfism, less advantageous biologically: difficult to successfully reproduce, selection for the heterozygote: sickle cell anemia. In tropical africa where malaria is a great disease burden, populations in. Africa have selected for a gene that is heterozygous for sickle cell anemia. If only some cells sickle, there is protection against malaria, a parasite that attacks the blood stream: selection against the heterozygote rh factor in blood.
