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Mutation is the source of variation in populations from "summary" of The Greatest Show on Earth by Richard Dawkins

Mutations are the raw material of evolution. They are random, accidental changes in the genetic code, the source of new genetic variation. Without mutations, there would be no genetic differences between individuals, and without genetic differences, there would be no evolution. These mutations can occur in various ways - through errors in DNA replication, exposure to mutagens like radiation or chemicals, or even through the activity of transposons, so-called 'jumping genes' that can move around within the genome, causing changes in the genetic sequence. Most mutations are harmful, leading to genetic disorders or diseases. However, some mutations can be neutral, having no effect on an organism's survival or reproduction. And occasiona...
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    The Greatest Show on Earth

    Richard Dawkins

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