B1. 8 Evolution

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  • Created by: Rchilds
  • Created on: 11-05-17 18:28
What is the accidental changing of a gene called?
A mutation
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What is Darwin's theory of how organisms get their characteristics called?
Natural selection
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Why was Darwin's theory slow to be accepted?
There wan't enough evidence, there were other competing theories at the time, not enough was known about genes and inheritance and some public opinion was against it on religious grounds.
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What is the theory of natural selection?
In a species there is variation. Those in the species who are better adapted to their environment are more likely to survive and reproduce, this will pass their successful genes on. Those who are not adapted die out so don't pass their genes on.
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How long does evolution take?
Many, many years and many generations
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What evidence do we now have for evolution?
Fossil records and genetic data show gradual changes over time as organisms adapt to their environment
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What was Lamarck theory of how organisms get their characteristics?
If it is useful to the organism, in their lifetime they will change their body, e.g. get stronger and build muscle. When they have offspring this will be passed onto their offspring so they will naturally be stronger.
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Why is Lamarck wrong?
Lamarck's theory is based on environmental factors, but only genes are passed on to offspring. Changing because of your environment (e.g. getting stronger/training to run faster etc) doesn't change your genes so won't effect your offspring
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In Darwin's time, why were there conflicting theories?
Scientists make observations, which they try and explain with a theory. New data might then be found that disproves their theory so they have to change it. Or, the new data might help give their theory more evidence, so make a stronger theory
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Card 2

Front

What is Darwin's theory of how organisms get their characteristics called?

Back

Natural selection

Card 3

Front

Why was Darwin's theory slow to be accepted?

Back

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Card 4

Front

What is the theory of natural selection?

Back

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Card 5

Front

How long does evolution take?

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