Los mecanismos de la evolución

The video explains how genetic variation leads to evolution, primarily through mutations. Mutations are random changes in DNA that can be passed to offspring if they occur in sex cells. Natural selection and genetic drift are two mechanisms that influence gene frequency. Natural selection enhances beneficial mutations, as seen in polar bears' evolution. Genetic drift, however, is random and can affect gene prevalence without impacting survival. Both processes contribute to the formation of new species over time.

What role does fitness play in the process of evolution?

Describe how environmental factors can influence genetic variation.