defined:

The historical development of a biological group (as a race or species); a theory that the various types of animals and plants have their origin in other preexisting types and that the distinguishable differences are due to modifications in successive generations.

explained:

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Dr. Francis Collins, former director of the National Human Genome Research Institute, defines evolution (SNPs).

related
terms:

mutation, gene, polymorphism, highly conserved sequence, deoxyribonucleic acid (DNA), genome

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