lajinvaihtelu
Lajinvaihtelu refers to the natural process of change in the genetic makeup of a population over generations. This variability is the raw material for evolution. It arises from several sources, the most significant being mutations, which are random alterations in DNA. These mutations can introduce new traits into a population. Another crucial factor is gene flow, the movement of genes between different populations through migration. Sexual reproduction also plays a vital role by recombining existing genes in new ways, creating novel combinations of traits in offspring.
The presence of lajinvaihtelu within a population is essential for its long-term survival. In changing environments,