B1 Evolution

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What was Jean-Baptiste Lamarck's theory on evolution?
The inheritance of acquire characteristics
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Explain Jean-Baptiste Lamarck's theory?
The inheritance of acquire characteristics - 1. Characteristics an organisms develops during its life time can be passed on to the next generation 2. People found this difficult to believe
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What was Charles Darwin's theory called?
The theory of natural selection
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Explain Charles Darwin's theory
1. Small changes in organisms took place over a long time 2. All organisms vary 3. Those that are best adapted breed and pass on their characteristics.
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Why was Darwin's theory of evolution accepted?
1. Challenged the idea that God created all life on earth in 7 days
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How did Darwin explain his theory?
He didn't know genes existed. 1. Birds in the Galapagos islands could change over time if they lived under different conditions
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What does it mean by the term the 'fittest' organisms survive?
The animals with the most suited characteristics to their enironment survive.
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Why do organisms show a wide range of variation?
1. Because of their differences in their genes
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What are mutations?
When a gene accidentally changes and becomes a new form of the gene. If the mutated gene control a characteristic to make them better, this is passed along.
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Why are mutated genes sometimes an advantage?
Particularly important in natural selection if the environment changes
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How can we make sense of how organisms are related?
By grouping organisms which is called classification.
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What is natural classification system?
1. Biologists study the similarities and differenced between organisms in order to classify them.
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What are the largest groups in systems called?
1. Kingdoms
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What are the main kindgoms
1. Plant Kingdom 2. Animal Kingdom 3. Kingdoms which contain microorganisms
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What are the smallest groups in classification systems called?
Species
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What are evolutionary trees?
Models that can be drawn to show the relationships between different groups of organisms
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What effect can occur in evolutionary trees whn new evidences are found?
Biologists can modify these evolutionary relationships.
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what do ecological relationships tell us?
How species have evolved together.
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Explain Jean-Baptiste Lamarck's theory?

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The inheritance of acquire characteristics - 1. Characteristics an organisms develops during its life time can be passed on to the next generation 2. People found this difficult to believe

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What was Charles Darwin's theory called?

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Explain Charles Darwin's theory

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Why was Darwin's theory of evolution accepted?

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