An important concept of Darwin's view of evolution was that natural selection operates on variation?

Question

What does this variation consist of? How does the variation arise? How does it spread through the population?

Answer 1

A variation is simply that, a variation. A black dog and a white dog can mate and produce all sorts of gray shaded dogs. Your mixing dark color genes with light color genes. Drive through Kansas and you will see rows and rows of corn stalk of different variaties. Dogs can not mate and produce corn and corn can not mate and produce a dog, the variety is limited within the kind. Corn has genetic material to produce corn and dogs have genetic material to produce dogs, so you get variation within the kind spread thoughout the population of either a corn stalk or a dog, you will never get a dogcorn or a corndog.

Answer 2

The variation consists of mutations in the germ line and recombination in meiosis.It spreads by frequency change in alleles; then the beneficial traits are accumulated by natural selection.

Answer 3

Variation is the difference in people. Skin color is a variation. Where people evolve causes variations.