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genetic drift
Random fluctuations (or "walk") of gene frequencies from generation to generation that occur in small , isolated populations. Through genetic drift, genetic information controling certain features may be lost from a population because it is not transmitted to the offspring. In large populations any specific trait is carried by so many individuals that unless it is unfavorable its loss is highly unlikely.
Related categories
• ORIGIN AND EVOLUTION OF LIFE
• GENETICS AND HEREDITY
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