ANT 1 Lecture Notes - Lecture 6: Vise, Pleiotropy, Centromere
Document Summary
Selection that favor plasticity (more or less flexible, responsive to environment) Ex: soapberry bugs mate guard (many males, less females) vs don"t mate guard. Natural selection will ensue - towards plasticity or stiffness. In unstable environments w/ variable sex ratios -> flexible (plastic) behavior evolves. In stable environments w/ fixed sex rations -> fixed (canalized) behavior. Genetic evolution: change in frequencies of alleles through time. Processes of evolution: mutation, genetic drift, gene flow. Can be passed onto offspring if it occurs in cell on path to becoming gamete. Imagine several alleles at locus in population - mutation within group. Mutation introduced in generation 1, another in gen 2 -> variation. Mendel"s laws show allelic variation maintained in inheritance despite sex. Allele variation is maintained when no evolution. Genotype variation is maintained when no evolution & random mating. Different mutation in both pop 1 & 2, another in gen 3 -> incr differences b/w pop.
