ANTH 1001 Chapter : Polymorphism And Adaptation
Document Summary
Situation where there exists 2 or more alleles for a gene, and at least 2 alleles. Due to natural selection acting on genetic variability cause by mutation. Polymorphism interaction btw natural selection and mutation have a frequency greater than 1% (relatively frequent) sustained by natural selection. Balanced polymorphism: polymorphism due to heterozygotes having higher. Variants coming into a population because of mutation or gene flow fitness than homozygotes heterozygotes carry 2 alleles and have a higher natural. Sickle cell trait: hemoglobin consists of 2 alpha and 2 beta polypeptide. Huge amount of genetic variability in a species selection advantage strands. Each alpha chain has 141 amino acids; each beta has 146 amino acids. Sickle cell hemoglobin results from point mutation affecting one amino acid in a beta chain. Malaria: caused by parasite transmitted btw individuals by mosquito. Heterozygotes for sickle cell have lower rate of malaria infection compared to homozygotes for normal hemoglobin.
