My Theory of Evolution - Scenario #1: "Now"
By chance, one trait is introduced into the genome of a specific individual living thing. If the trait is immediately advantageous over those of the same species who do not possess the trait, then the trait will very likely be passed along to future generations. If the trait is immediately undesirable, then the individual will be rejected by its peers and will be unable to pass along the new trait. This is called evolution.
My Theory of Evolution - Scenario #2: "Later"
By chance, one trait is introduced into the genome of a specific individual living thing. The trait is neither immediately advantageous or immediately undesirable. Over 10's of generations, the trait is very quietly passed along to a significant portion of the species (perhaps 3% or even 75%). After a significant time has passed, a significant event occurs. That event causes Scenario #1 to nearly immediately affect a significant portion of the species (those with the trait will die out or those without the trait will die out). This is called evolution.
The Random Trait Home Game!
A fun little game I sometimes play is to theorize why a specific animal or human characteristic was advantageous in the past. Maybe a specific trait allowed our ancestors to live long enough to get laid? Or maybe a specific trait somehow made our ancestors more desireable to the opposite sex? Or maybe a specific trait just randomly entered our genome without any bearing on evolution (yet!) ?
Some characteristics are easy to figure out. Why is sex fun for you? Easy! If your ancestors never had the "sex is fun" gene, then they wouldn't have had sex and you wouldn't have been born
What do you think? Any other interesting characteristics to discuss? This is fun for me