ANTH 1001 : Anthropology Test 2
Document Summary
Polymorphism: interaction between natural selection and mutation: def. : balanced polymorphism- situation where there exists 2 alleles for a gene, and at least 2 alleles have frequency > 1%. In malaria environment, heterozygotes for sickle cell have natural selective advantage over homozygotes for normal hemoglobin and sickle cell. Alleles for both normal and sickle cell hemoglobin are maintained at high frequencies; this is a balanced polymorphism: spread of slash-and-burn agriculture is related to natural selective advantage of sickle cell allele, agricultural practices mosquitos spread human malaria spread of. Meaning, selection acts of the phenotypic/genotypic variability that exists in a population: populations differ in their rbc mutations: sickle cell, thalassemia, and g- Each rbc variant is selectively advantageous in malaria environment; consequently, each variant is perpetuated by natural selection. 1: interaction of natural selection and mutation means that populations may show different adaptations to the same environmental stress, evolutionarily, different ways of solving the same problem, force of evolution.
