Chpt. 1 Evolution of Behavior
How did some species evolve?
What evolved from what: we base our answer upon fossils and comparisons of living species
i.e.) Figure 1.10 Evolutionary tree
How do species evolve?
How the process works: the process is a necessary outcome. Evolution must occur because of
Offspring resemble their parent’s genetics
Mutations, recombination’s and micro duplications of genes introduce new variations that are heritable
that can either help or harm an individual’s chance of surviving and reproducing
Certain individuals reproduce more successfully than others thus passing on their genes to a new
generation. Any more prevalent genes will become more prevalent in later generations.
Artificial Selection: when an animal, human or plant chooses a mate that specifically carrier a desired trait
with them so their offspring can carry on that desired trait ( i.e.) breeding racehorses, hundred breeds of
Charles Darwin (1859) also backed up this theory by explaining how it occurs in nature.
Misunderstandings About Evolution
Lamarckian Evolution: carry-over of evolution through the inheritance of acquired characteristics (i.e.) lack
of usage for pinkie toe will cause the next generation to have smaller ones False
Have humans stopped evolving? : No because evolution does not only require survival it also requires
reproduction so certain genes passed down from generations might change us
Does evolution mean improvement? Evolution improves fitness: number of copies of ones genes that
endure in later generations (any gene that spreads is fit). If you have many children that later reproduce,
you are fit. If you support your relatives who reproduce their own children, you are fit. Some passed down