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 
Flashcards (26)