Darwin's Finches are an example of natural selection in action. They are an excellent example of the way species' gene pools have adapted in order for long term survival via their offspring. See this tutorial for more elaborate info on natural selection as exemplified by Darwin's finches...
This tutorial investigates the genetic diversity in more detail. It also delineates how certain alleles are favored over other alleles in natural selection. ..
Gregor Mendel's studies into Monohybrid and Dihybrid crossing and Charles Darwin's study of evolution and natural selection have led to studies that actively manipulate the phenotype of offspring by selective breeding in animals and plants. ..
The diversification of several new species from a recent ancestral source, each adapted to utilize or occupy a vacant adaptive zone is referred to as adaptive radiation. 'Darwin's Finches' exemplified adaptive radiation. For more elaborate info on adaptive radiation, read this tutorial...
Multicellular organisms evolved. The first ones were likely in the form of sponges. Multicellularity led to the evolution of cell specializations that form tissues. Another major event was the evolution of sexual reproduction. The emergence of sex cells in the timeline provided a means for organisms to further diversify. Know more about these crucial events in geologic time in this tutorial...
According to Charles Darwin's theory of natural selection, preferable genes are favored by nature in the gene pool, and over time, these preferable characteristics become more exclusive in the gene pool. This tutorial rounds up all the factors that can alter the makeup of a gene pool...