Principles of Evolution - 1We have seen in this course that recombination, segregation of alleles, andindependent assortment of homologous chromosomes during meiosis results in thevariation that occurs among individuals in populations. We have seen, too, thatmutation is a source of increasing variation within populations. Each individual'sphenotype depends on how the alleles he or she inherits interact in geneexpression.Some inheritance patterns, such as multiple alleles of a single gene, and thecontinuous variation resulting from polygenic inheritance, are observed only withinthe framework of population genetics.We have also learned that the frequency of a gene (or specifically, an allele)affects its appearance in populations. For example, in human blood types, B is aco-dominant allele, though not common within most populations, so that O and Aphenotypes are much more abundant.In the next few lectures we will look at variations that appear within populations
This is the end of the preview.
access the rest of the document.