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Mutations (1 of 2)
Mutation is a change in DNA, the hereditary material of life. An organisms DNA affects how it looks, how it behaves, and its physiologyall aspects of its life. So a change in an organisms DNA can cause changes in all aspects of its life.
Mutations are random.
Not all mutations matter to evolution.
For example, the golden color on half of this Red Delicious apple was caused by a somatic mutation. The seeds of this apple do not carry the mutation.
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Spanish translation of Understanding Evolution For Teachers from the Spanish Society of Evolutionary Biology.