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9 Cards in this Set
- Front
- Back
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Define Natural Selection.
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The greater chance of passing on genes by the best adapted organism.
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Define Mutation.
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It is a change in the gene or chromosome.
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What influences continuous variation?
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It is influenced by the environment and genes, resulting in a range of phenotypes between two extremes.
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What causes discontinuous variation?
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It is caused by genes alone and results in a limited number of distinct phenotypes with no intermediates.
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Outline the effects of ionizing radiation on mutation.
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Ionizing radiation changes the chemical structures in body cells, therefore mutations occur.
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Describe variation.
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The genetic differences within and among populations.
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State what competition leads to.
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It leads to the survival, and reproduction, of the organisms best fitted to the environment.
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What is the significance of natural selection?
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It is a mechanism for evolution.
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Describe the development of antibiotic resistant bacteria.
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Antibiotic resistant bacteria form due to natural selection. Mutations in the genes cause some bacteria to survive, which can then rapidly reproduce since there is no competition for food.
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