723894
Description
Mind Map by Lauren Robinson, updated more than 1 year ago
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Created by Lauren Robinson
almost 11 years ago
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Extinction and Speciation
- Extinction
- Causes
- If the environment changes
rapidly (destruction of habitat)
- New predator
- New disease
- A catastrophic event
- Can't compete with a
new species for food
- Speciation
- If the environment changes
rapidly (destruction of habitat)
- Happens if a species is unable to
evolve quick enough
- Causes
- Speciation
- Where a group of similar organisms can
reproduce to give fertile offspring, therefore
it is the development of new species.
- Speciation occurs when populations of the
same species become so different that they
can no longer breed togther
- Speciation occurs when populations of the
same species become so different that they
can no longer breed togther
- Isolation and natural selection
- Isolation is where populations of species get separated.
- This can be due to a physical barrier. E.g a flood
could cause a physical barrier that geographically
isolates some organisms, and if the conditions are
different, the two groups may have different
characteristics
- This can be due to a physical barrier. E.g a flood
could cause a physical barrier that geographically
isolates some organisms, and if the conditions are
different, the two groups may have different
characteristics
- Natural selection is "survival of the fittest"
- Each population shows variation as
they have a wide range of alleles
- In each population, organisms with more
adapted characteristics have a better
chance of survival, and therefore breed
- Therefore the alleles that control the beneficial
characteristics are more likely to be passed on
- Therefore the alleles that control the beneficial
characteristics are more likely to be passed on
- In each population, organisms with more
adapted characteristics have a better
chance of survival, and therefore breed
- Each population shows variation as
they have a wide range of alleles
- Isolation is where populations of species get separated.
- Where a group of similar organisms can
reproduce to give fertile offspring, therefore
it is the development of new species.
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