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Chapter 17 (Population Genetics (type concept of species (how biologists…
Chapter 17
Population Genetics
deals with the abundance of different alleles within a population and the manner in which the abundance of a particular allele increases or decreases or remains the same over time
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the genetic recombination only occurs during sexual partners having different genotypes #
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divergent Speciation
Reproductively isolated
same species, different alleles
Abiological Reproductive barriers # #
any physical nonliving feature that prevents two populations from exchanging genes is an biological reproductive barrier
species is divided and cannot interbreed I'd speciation results its called allopatric or geographic speciation
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Adaption Radiation
special case of divergent evolution in which a species rapidly diverges into many new species over an extremely short time
founder individuals because the initial gene pool is extremely small if just one seed is the founder the original gene pool consists of its two sets of alleles
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convergent evolution
two may evolve to the point that they resemble each other strongly and are said to have undergone convergent evolution
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gene flow occurs in many ways such as by pollen transfer, seeds dispersal and vegetative propagation
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Seed dispersal
the suits and seeds of some plants fall close to the parents but many species have long-distance dispersal mechanisms
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Formations of polymers
monomers present in the early ocean had to polymerize if life were to arise but polymerization required high concentrations of monomers
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