bio CAT 1
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25 Terms
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Intra-specific variation
variation between the same species
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inter-specific variation
variation between different species
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causes of variation
genetic and environmental
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first step in evolution by natural selection
a random mutation occurs
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second step in evolution by natural selection
the organisms with the mutations are better suited to their environments
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third step in evolution by natural selection
this would increase their chance in survival
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fourth step in evolution by natural selection
giving them more opportunities to reproduce
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fifth step in evolution by natural selection
and pass their successful genes to their offspring
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sixth step in evolution by natural selection
overtime, beneficial characteristics become more common and the species evolve
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mutation
change in the DNA sequence of a gene
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variation
a different version of something
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environment
your surroundings where you operate
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survival
the state of continuing to exist
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reproduce
production of offspring
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genes
a part of a DNA sequence
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evolution
change in characteristics of a species over time
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natural selection
survival and reproduction of species
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allopatric speciation
new species arrive because of geographic isolation, forcing the species to evolve differently from each other
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sympatric speciation
new species arrive because of reproductive isolation, meaning certain animals just dont want to reproduce with each other
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first step in the process of speciation
a population becomes separated
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second step in the process of speciation
the two areas are different from each other, different food, different terrain, different predators
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third step in the process of speciation
in the two new areas the desirable characteristics are now different
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fourth step in the process of speciation
a random mutation occurs in one population which gives them an advantage in the new area
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fifth step in the process of speciation
the organisms with the new mutation now outcompete others in their species, and reproduce to pass the characteristics to their offspring
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sixth step in the process of speciation
if this happens enough times, the two populations would not be able to reproduce and create fertile offspring. They are different species
Note 
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