Thursday, February 24, 2011

Blog #4 Types of Selections

Directional variation is when a species have extreme variations in traits in an environment. An example of this are Greyhound Dogs, these dogs were breeded to have the greatest speed even running up to  40mph! Stabilizing selection favors the average traits in a population such as Siberian Huskies. All of the huskies have strong leg muscles so they could walk/run through dense snow easily. Disruptive selection favors the extreme traits in a species. An example of this could be birds with large beaks, by having these beaks they could survive longer than other bird with smaller ones.

Wednesday, February 16, 2011

Blog #3 Microevolution

Microevolution is a change in gene frequency in the (one) population. The ways that this may occur are mutation, artifical AND natural selection, gene flow, and genetic drift.

Blog #2 Fossils Hard to Interpret

There are many things that fossils could've been. They could've been plants, animals, and many more. There are not many facts that a fossil may give us. All we may 100% know is that something died and was buried at that spot. We may not know how the thing died or when it died. Unless the feature is easily seen like a large blow to the skull and is noticeable, we may not know how the thing died.

Thursday, February 3, 2011

Blog #1 Evolution Theory

Evolution is considered as a theory because evolutionists have not been able to prove that it has taken place. Many people think that it is a law because earth's lifeforms has evolved over billions of years.  In science, a law is explanation of the natural world that is so firmly established that it has a very high chance of not changing.