So this afternoon I was thumbing through my parents’ “Time” Magazine and came across a very interesting article about natural selection and how our ideas about evolution may be challenged. Basically, the article talks about how the outside environment affects our genes more drastically than we thought and how those changes may actually be being [...]
Natural selection + geographical isolation…on the way to new species when reproductive isolation happens. 3 minute video.
At the beginning of class today we started with a review of natural selection. The primary components that make natural selection possible are: 1. Genetic Variation (due to meiosis and mutation) 2. Overproduction of offspring 3. Struggle for existence 4. Different rates of survival and reproduction Now back to the main topic of class today. [...]
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 [...]
Today in class we began talking about evolution. The first thing we discussed was the history of earth’s evolution. Scientists believe that earth formed about 4.5 billion years ago. Life on earth formed about 3.7 billion years ago. In this .8 billion year span with no life, the Earth underwent chemical evolution. In this time [...]