Speciation

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  • Created by: J.E.C.
  • Created on: 17-04-14 17:06
What is a species?
A group of individuals that share similar genes and are capable of interbreeding to produce fertile offspring.
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Members of the same species belong to the...?
Same gene pool.
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Define Speciation?
The evolution of new species from existing species.
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Geographical isolation occurs when...?
A physical barrier prevents two populations from breeding with one another.
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Give the first two steps of speciation associated with conditions becoming drier?
1. Individuals of species X form a single gene pool and freely interbreed. 2.Climate changes over the centuries lead to drier conditions which reduce the area of forest and separate it into two regions that are many hundreds of km apart.
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Give steps 3,4 & 5?
3. Climate changes cause one forest region (A) to become wetter and colder and the other region (B) to become warmer & drier. 4.Region A: phenotypes suited to colder,wetter conditions selected.5.Region B: ptype suited to warm, dry conditions selected
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Give steps 6 & 7?
6. Type & frequency of the alleles in the gene pools of each group of species X becomes increasingly different. 7. In time, differences become so great = separate species.
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Describe step 8?
Further climate change may lead to regrowth of the forest and the species being reunited. They will not be able to interbreed as they are now different species.
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Other cards in this set

Card 2

Front

Members of the same species belong to the...?

Back

Same gene pool.

Card 3

Front

Define Speciation?

Back

Preview of the front of card 3

Card 4

Front

Geographical isolation occurs when...?

Back

Preview of the front of card 4

Card 5

Front

Give the first two steps of speciation associated with conditions becoming drier?

Back

Preview of the front of card 5
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