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Topics in Depth

The Origin of Species

Stop us if you've heard this one:There once was a man on the BeagleThis Darwin, studied finches and seagullsSpecies that he collectedHinted they were naturally selectedAn idea some thought quite il...

The Gene Pool

Ready For a Dip?It's time to break out your swim trunks and floaties, because we're going for a dip in the gene pool.Okay, so we can't really swim in a gene pool. Just pretend we can sit by its edg...

Mutations

Teenage Mutation Ninja TurtlesMutations often get a bad rap, but who doesn't want to mutate from a sweet little pond turtle to a massive crime-fighting ninja reptile? Are mutations good or bad? Eh...

Gene Flow and Genetic Drift

Just Goin' With the (Gene) FlowRemember Gilligan's Island? Gilligan's crew is part of a very small human populations separated from the rest of the human species. If they never got off the Island,...

Sexual Selection

That's a Fine Pair of Genes You're WearingWe know we aren't supposed to judge a book by its cover. No one told the peacocks, though. Peacocks can be totally judgmental. After all, a junky paperback...

Natural Selection

Survival of the fittestNatural selection is determined by an organism's fitness. But by fitness, we don't mean winning a strong man's competition. In fact, if natural selection depended on fighting...

Speciation

It's Not You, It's Me.Ah, the classic break-up conversation. Species have been breaking it off with their ancestors for years. When a new species, or "kind" is formed from an existing species, its...

Common Mistakes

Charles Darwin and the Origin of the SpeciesRemember that a genotype represents an organism's genes, while a phenotype is a physical characteristic.  Multiple genes can affect one phenoty...

Test Your Knowledge!

Charles Darwin and the Origin of the Species1. Which of the following affect natural selection?  (A) Time(B) Environment(C) Geography(D) A and C(E) All of the above2. True or Fal...

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