Why is variation in populations important for Charles Darwin?

Charles Darwin's voyage on the HMS Beagle and his ideas about evolution and natural selection. ... Natural selection depends on the environment and requires existing heritable variation in a group. What is evolution? The basic idea of biological evolution is that populations and species of organisms change over time. read more

Explain why variation was so important to Darwin's theory of evolution. • Variation among individuals in a population was the key to understanding the nature of a species. 3. read more

1. Gene Flow− the transfer of alleles or genes from one population to an other 2. Genetic Drift− variation in the relative frequency of different genotypes in a small population, owing to the chance disappearance of particular genes as individuals die or do not reproduce 3. read more