14-27 - 5 digits on hands and feet Opposable thumb + big...

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Anthropology notes on natural selection and primates Natural section favorable heritable traits become more common in successive generations of a population and vice versa Works on individuals but is expressed in populations Works on the phenotype but is expressed in genotype Adaptation=in possession of traits suitable for the environment Darwinian Fitness=ability to reproduce and pass traits to offspring When two cells join: Homozygous = chromosome pair with identical alleles for a single gene Heterozygous = chromosome pair with different alleles for a single gene Primates Mammals Includes: apes, monkeys, lemurs, tarsiers, lorises, and humans About 190 species of non-human primates General Primate Characteristic (not equally expressed in all primates) Tendency towards upright posture A flexible generalized limb structure, which allows for a variety of locomotory behaviors Prehensility
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Unformatted text preview: 5 digits on hands and feet Opposable thumb + big toe Nails instead of claws Sensory pads at ends of digits Lack of dietary specialization-omnivorous Reliance on sense of vision o Color vision (nocturnal primates color blind) o Binocular vision o Stereoscopic vision (information from eyes goes to both sides of the brain) o 3D o Depth perception Decreased reliance on the sense of smell Expansion and increased complexity of the brain Longer gestation and maturation periods and longer life span Greater dependence on learned behavior Tendency to live in social groups Tendency for diurnal activity Dentition Evolutionary trend is reduction in number and size of teeth o 3-1-5-3 = early mammals o 2-1-4-2 = early fossil primates o 2-1-3-3 = new world monkeys and Prosimii o 2-1-2-3 = old world monkeys and hominoidea Y5 in molars...
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14-27 - 5 digits on hands and feet Opposable thumb + big...

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