How nature shuffles and breaks DNA to create diversity
In short: Explore the biological mechanisms that ensure no two individuals are exactly alike. This lesson explains how cells rearrange genetic material and how spontaneous errors drive the evolution of life.
Genetic variation arises from three primary drivers: recombination, mutation, and environmental influence. During meiosis—the specialized cell division for sexual reproduction—chromosomes can swap sections with one another. This process creates unique genetic combinations in every generation.
While DNA replication is highly regulated to ensure accuracy, occasional errors occur, leading to mutations. These changes can be triggered by external environmental factors or internal biological processes. When these mutations are viable, they become heritable traits that contribute to the diversity of species.
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Sources
- Summary by Intellect · source: Sources of genetic variation | Inheritance and variation | High school biology | Khan Academy
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