B2 Natural selection

What did Charles Darwin say in his theory of natural selection about how evolution might happen, 150 years ago?
If animals and plants are better adapted to their environment then they and the following generations are more likely to survive
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What do we know now about how adaptations are passed on?
When organisms reproduce, their genes are passed on to the next generation
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There is variation between...
Any species
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There is competition for limited resources like food because...
Organisms produce far more young than will survive
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Survival of the fittest is when...
Only those best adapted will survive and those that survive pass on successful adaptations through their genes
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New species may be created if....
Different groups of organisms cannot mate for a long time
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Why may organisms be prevented from mating?
1) Geographical isolation (living in different areas) 2) Behavioural isolation
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Why is natural selection difficult to study?
It takes thousands of years to see the effect
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Modern example of natural selection is...
Bacteria developing resistance to antibiotics
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Modern example of natural selection is...
Dark peppered moths are better camouflaged than pale ones in polluted areas so more survive
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Why did people disagree with Darwin's ideas at first?
1) Not enough evidence to back theory 2) Believed that God created all species
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Darwin's theory is now more widely accepted because...
1) Explains lots of observations 2) Discussed and tested by a wide range of scientists
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What did Lamarck say in his theory of evolution?
He believed that if a characteristic was used a lot by an organism then it would become more developed, and these acquired characteristics would be passed on offspring
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Why was Larmarck's theory rejected?
It was discovered that acquired characteristics don't have a genetic basis (cannot be passed on)
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Other cards in this set

Card 2

Front

When organisms reproduce, their genes are passed on to the next generation

Back

What do we know now about how adaptations are passed on?

Card 3

Front

Any species

Back

Preview of the back of card 3

Card 4

Front

Organisms produce far more young than will survive

Back

Preview of the back of card 4

Card 5

Front

Only those best adapted will survive and those that survive pass on successful adaptations through their genes

Back

Preview of the back of card 5
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