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This 2 page Reader was uploaded by Elizabeth Gruber on Tuesday October 7, 2014. The Reader belongs to a course at a university taught by a professor in Fall. Since its upload, it has received 37 views.
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Date Created: 10/07/14
Sexual Selection sexual dimorphism in primates large canines larger body size than females manes brightly colored genitals cheek anges Species and Species Concepts HardyWeinberg Equilibrium mathematical description of simple genetic system 2 alleles p and q in a hypothetical infinitely large randomly mating population assumes NO mutation genetic drift gene flow selection including nonrandom mating pq2rgt22pqq21 demonstrates that allele frequencies in the population should not change over time if allele frequencies are changing gt some form of evolution is occurring evolutionary change does not usually happen in isolation speciation formation of one or more new species via reproductive isolation Types of Speciation allopatric speciation via geographic isolation parapatric speciation new niche develops into species sympatric speciation polymorphism different phenotypes separate into separate species stable hybrid zones Biological Species Concept naturally occurring breeding population that is reproductively isolated either actually or potentially from other such groups Ernst Mayr Reproductive Isolation Mechanisms premating geographic seasonal habitat temporal courtshipsignaling copulatory failure postmating no fertilization zygotefetal death offspring sterility Alternate Species Concepts recognition species concept set of organisms living under natural conditions that can recognize each other as potential mates ecological species concept set of organisms adapted to a particular set of resources called a niche in the environment evolutionary species concept a single evolutionary lineage of interbreeding organisms living in natural conditions that can be distinguished from other lineages through both time and space Reproductive Asymmetry males have higher potential and variance why because females typically invest more in offspring than males do consequences females try to maximize access to resources and infant survival female organisms should be more selective in reproductive choices males maximize reproductive opportunities males often compete for female choice sexual dimorphism males often have more extravagant features than females
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