PSYCH 9A Lecture Notes - Lecture 2: Twin, Total Variation, Stepfamily
26 Jan 2014
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Chapter 2: the genetic and evolutionary roots of behavior. Pku depends on diet, not just recessive alleles of that particular gene: codominance- both genes in the pair affect the phenotype. Blood type: incomplete dominance- person with two different alleles with have a phenotype that"s intermediate between the types favored by each allele on its own. Evidence for evolution by natural selection: three spine stickleback, vestigial structures. The unity of life: all of earth"s living things are derived from a common lineage. Jellyfish with green fluorescent protein inserted into monkeys, makes monkeys green. Genes and evolution: darwin"s 3 important principles, 1. Must be variation among individuals within a population: 2. Certain of the variants must survive and reproduce at higher rates than others: 3. Traits associated with this superior survival and reproduction must be passed. Like ordinary siblings, they share 50% of their genes: monozygotic- twins that develop from a single fertilized egg that then splits in half.
