Dec 17 2009
Okay, so geographical isolation is when groups from the same population of the same species are physically isolated for a long period of time while reproductive isolation is when natural selection and mutation in geographically isolated populations occur until the populations are no longer able to reproduce. So, geographical isolation results in reproductive isolation. But [...]
Nov 16 2009
Natural selection + geographical isolation…on the way to new species when reproductive isolation happens. 3 minute video.
Nov 04 2009
One of Mr. W’s favorite brain rules is #5, repeat to remember, so lets revisit what we learned yesterday about niches. Every organism has a niche, but how are they determined? What you eat Where you work (habitat) Role in energy flow Role in matter cycling Interactions with others When an organism’s environment changes, it [...]
Nov 03 2009
An organism’s niche in its community is more that just its “job,” it is its role in relation to where it works, what it eats, where energy flows, how matter cycles, and how it interacts with other organisms. This interactions with the ecosystem, more specifically the biotic portion, is what shapes an organism’s niche. Niches [...]
Oct 30 2009
The last two days we discussed mass extinction, and viewed a PBS video about them. You can find some of the ideas at the link, below. After reading the intro, click continue, then click on the part of the timeline that says “hominids” (don’t start at the beginning) and then read each pop-up and click [...]
