Thursday, December 6, 2007

"Larkey Natural Selection: Day 2"

Bellwork:
1) Write the better example of natural selection:
-A) Rabbits in the arctic have white fur because white rabbits are more likely to survive and reproduce.
-B) Brown bears moved to the woods because they would survive better there.
2) Different expressions of a trait that increase the chance of a population surviving are ____________.
3) Draw the Punnett square (L=long fur)
The puppies of an Ll and an LL dog will have ______________ fur.

- Finish larkey natural selection activity: workbook page 117
-Summing it up:
a) The selective pressure for the larkeys: Their predators
b) On the prairie, larkeys with short legs and spots get eaten by coyotes
c) Larkeys with long legs and stripes survive, reproduce, and pass on the genes for long legs and stripes
d) Over 4 generations, the genes for short legs and spots disappear
e) And the genes for long legs and stripes increase, so the larkeys don't go extinct