ANTHR150 Lecture Notes - Phenotype, Microevolution, Genetic Drift
23 Jun 2014
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Document Summary
Classifying human biological diversity: codominance, regulatory genes: initiate or block the activity of other genes. not always expressed in the individual (e. g. : a trait affected by the result of the interaction, modifying genes: a second gene that alters the expression of the first of several genes (e. g. stature, skin colour). Incomplete penetrance: diabetes): pleiotropy: sickle cell anemia having the two thinner ones causes lack of oxygen which never happens and areas where there are malaria you have one sickle cell which protects you from malaria) change in the sequence of the dna. Sources of biological variation: mutations are the only new source of alleles in a species, sexual reproduction recombines the parents dna to form new combinations, random mating is a process whereby every allele has an equal chance of being passed on to the next generation, natural selection acts on this variation by differential reproductive success.
