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EVOLUTION (Type of species (morphorlogical species (distinguishes a…
EVOLUTION
Type of species
biological species
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the concept emphasizes reproductive isolation through prezygotic and postzygotic barriers that seperates gene pools
speciation
Allopatric speciation
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for example water in a lake may subside to two more smaller lakes that now home seperated populations
when geographical isolation has occured, the seperated gene pools diverge
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Evoution of population
Genetic variation
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in sexually reproducing organism, most of their genetic difference among individuals result from crossing over, independent assortment of chromosomes, and fertilization
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Hardy-Weinberg equation
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when a allele and genotype frequency remain constant from generatin to generation provided only mendelian segration and re combinatio of alleles are at work, the population is said to be i Hardy=Weinberg Equilibrium
Gene flow and drift
in genetic drift , chance fluctation in allele frequencies over generations tend to reduce genetic variation
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Darwinian view of life
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Natural srelection
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when environment changes or individauls move to a new environment, natural selection may result in adaptation to these new environment
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