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Who came up with the theory of natural selection?
Charles darwin
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What is the general idea of natural selection?
The best adapted organisms are the ones to survive as they would be the successful competitors. He called it survival of the fittest.
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How does natural selection lead to evolution?
As the well adapted species survive, they pass their adaptations on to their offspring
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What was wrong with Darwins theory, and why?
Hw couldnt explain why natural selection happened, because DNA was only found 50 years later.
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What do we know about adaptations that Darwin didnt?
Adaptations are in the genes, they arise due to mutations in the genes and are passed on in genes.
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Over a long period of time a species may evolve so much that a new species evolves. What is this called?
Speciation
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How can speciation be caused by a physical barrier?
E.g. if a river changes course, organisms of the same species have to survive in different environments, so adapt differently.
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Why didnt people believe Darwin?
Went against religious views, he couldnt say why, no evidence for scientists
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What was Lamarks theory?
If a characteristic was used a lot it would be passed on (e.g. a rabbit runs, gets big leg muscles, offspring has big leg muscles)
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Why do most people now accept darwins theory?
More evidence and it has been tested
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Other cards in this set

Card 2

Front

What is the general idea of natural selection?

Back

The best adapted organisms are the ones to survive as they would be the successful competitors. He called it survival of the fittest.

Card 3

Front

How does natural selection lead to evolution?

Back

Preview of the front of card 3

Card 4

Front

What was wrong with Darwins theory, and why?

Back

Preview of the front of card 4

Card 5

Front

What do we know about adaptations that Darwin didnt?

Back

Preview of the front of card 5
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