You are reading a single comment by @Chuckles and its replies.
Click here to read the full conversation.
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
@Chuckles
Wikipedia has spoken!
"Two major mechanisms determine which variants will become more common or rare in a population. One is natural selection ... Over many generations, adaptations occur through a combination of successive, small, random changes in traits, and natural selection of the variants best-suited for their environment.[4] The other major mechanism driving evolution is genetic drift, an independent process that produces random changes in the frequency of traits in a population."
[I cut out two sentences on natural selection that discuss fit between organism and environment, which is the non-random part. What makes it possible is random variation.]