Variation (4)
speciation (12)
Diploid and haploid review (9)
Sexual dimorphism (18, you don't have to watch it all) (parent review, skip about 12 to 14 + minutes if you want to avoid the human stuff)
Another (10 minutes), optional
Quiz, pp. 453 -- 461
1. Define and give an example:
nonheritable difference within a population
polymorphism
cline
mutation
2. Are most mutations beneficial or harmful to the organism they show up in?
EC Evolutionary theory has adapted over the decades to posit that drift is a major component of evolutionary change, and mutation less important than we thought. Give me a reason why scientists might have refined the theory in this way.
3. Most eukaryotic cells are diploid; this means that in sexual recombination the r_________ and d_______ alleles can provide variation.
4. The effect of selection can be d______________, d_____________ or s__________________.
5. Sexual dimorphism is a distinction in appearance due to secondary sexual characteristics. It can lead to intrasexual selection, where an individual wins a competition with another organism of the same sex (e.g. antler battles) ; or it can lead to in_________ selection, where members of one sex choose the winner from the other (normally the f_________ organism selects a m______ mate for reproduction).
6. Evolution is a process, not a person; it doesn't "choose" winners and losers, organisms in a population survive in their niche to reproduce according to its rules. It can only work upon t________ that arise, can only play the hand its dealt.
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