Extinction

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We are currently in the 7th mass extinction phase the Earth has seen meaning...
more tahn 10% of the species currently alive today will become extinct within a century
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Reasons for Extinction - 1. The environment changes too quickly...
2. A new predator kills them
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3. A new disease kills them...
4. They can't compete with another new species for food
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5. A catastrophic event happesn - like a volcano errupting-...
A new species develops
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Speciation is a group of similar organisms that can...
reproduce to give fertile offspring
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It is the development of a new species and occurs when populations of...
the same species become so different that they can no longer produceysicl fertile offspring
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Isolation is where populations of a species are sperated and this can happen due to...
a physcal barrier
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Floods and earthquakes can cause barriers that geographically isolate some individuals from...
the main population and conditions on each side will be slightly different
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There may be different climates on each side and because the environment is...
different, different charecteristics will become more common due to natural selection
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1. Each population shows variation because...
they have a wide range of alleles
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2. In each population, individuals with characteristics that make them better adapted to...
their environment have a better chance of survival and breed successfully
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3. The alleles that control the beneficial characteristics are more likely to...
be passed on to the next generation
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Other cards in this set

Card 2

Front

2. A new predator kills them

Back

Reasons for Extinction - 1. The environment changes too quickly...

Card 3

Front

4. They can't compete with another new species for food

Back

Preview of the back of card 3

Card 4

Front

A new species develops

Back

Preview of the back of card 4

Card 5

Front

reproduce to give fertile offspring

Back

Preview of the back of card 5
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