GCSE AQA Biology 1 Evolution

Lilac Potato
Mind Map by , created over 4 years ago

Mind map showing key facts about natural selection, mutations and Darwin and Lamarck's theories

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Lilac Potato
Created by Lilac Potato over 4 years ago
GCSE AQA Biology 1 Quiz
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1 Evolution
1.1 The theory of evolution

Annotations:

  • More than 3 billion years ago, life on Earth began as simple organisms from which all the more complex organisms evolved.
1.2 Similarities/differences allow classification

Annotations:

  • 1) Plants make their own food and are fixed to the ground 2) Animals move about and can't make their own food 3) Microorganisms are different to plants & animals
1.3 Evolutionary and ecological relationships
1.3.1 Evolutionary

Annotations:

  • * Species wich similar characteristics - similar genes because they share common ancestor (closely related), often look alike and live in similar habitat * Genetically different species can look alike too * Evolutionary trees show common ancestors/ relationships between organisms (more recent, more closely related)
1.3.2 Ecological

Annotations:

  • * Organisms in same environment with similar characteristics - might be in competition * Differences between organisms in same environment can show predator-prey relationships
2 Natural Selection
2.1 Charles Darwin's idea
2.2 1) Individuals within species show variation due to differences in genes
2.2.1 2) Individuals with characteristics that make them better adapted to environment have better chance of survival - more likely to breed successfully
2.2.1.1 3) Useful genes more likely to be passed on to next generation
3 Mutations
3.1 Mutation: Change in organism's DNA
3.2 Mostly, mutations have no effect but can be beneficial i.e. produce useful characteristic
3.2.1 Beneficial mutation more likely to be passed on by natural selection
3.2.1.1 Over time, beneficial mutation will accumulate in a population
4 Darwin's idea was very controversial at the time...
4.1 Wasn't enough evidence to convince many scientists

Annotations:

  • Not many other studies had been done into how organisms change over time
4.2 No good explanation of how appeared or passed on - didn't know about genes/mutations
4.3 Went against religious beliefs - no need for God
5 Lamarck
5.1 Argued that if characteristic was used a lot it would become more developed in its lifetime
5.1.1 Believed acquired characteristics would be passed onto next generation
6 Evidence
6.1 Lamarck's hypothesis rejected - experiments didn't support
6.2 Discovery of genetics supported Darwin's idea

Annotations:

  • Provided explanation of how organisms born with beneficial characteristics can pass them on (via their genes)

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