5076908
Description
Flashcards by francesca graham, updated more than 1 year ago
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Created by francesca graham
about 8 years ago
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| Question | Answer |
| What does the fossil record contain? | Many species that don't exist any more |
| Give 6 reasons why species become extinct | 1) Environmental changes 2) New predators 3) New diseases 4) New competitors for food 5) A catastrophic event 6) A new species develops (speciation) |
| What is speciation? | The development of a new species |
| What is a species? | A group of similar organisms that can reproduce to produce fertile offspring. |
| When does speciation occur? | When populations of the same species become so different that they can no longer breed together to produce fertile offspring |
| What 2 things lead to speciation? | Isolation and natural selection |
| What is isolation? | Where populations of a species is separated. |
| What causes isolation? | Physical barriers |
| How does speciation occur? | |
| Why do different environments cause speciation? | Different characteristics will become more common in each population due to natural selection |
| How does natural selection effect speciation? | In each population, individuals with characteristics that make them batter adapted to their environment have a better chance of survival and so are more likely to breed successfully. So the alleles that control the beneficial characteristics are more likely to be passed on to the next generation |
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