Blog # 4 Describe the three types of selection: directional, stabilizing and disruptive and give an example of each.
Directional:a pathway of natural selection in which one uncommon phenotype is selected over a more common phenotype. An example would be Breeding
Stabilizing:a type of natural selection in which genetic diversity decreases as the population stabilizes on a particular trait value. An example of this would be human baby birth weight
Disruptive describes changes in population genetics in which extreme values for a trait are favored over intermediate values. An example would be Rabbits
Blog #3 Explain what microevolution is? What are the three ways that variation occurs?
Microevolution is the smallest scale of evolution, that occurs over a number of generations. The gene pool is changed such that a particular allele will result in a higher likely hood of survival for the organism. These alleles would then be passed down altering the future population.
The three was that the variation occurs:
- Directional Selection
- Stabilizing Selection
- Disruptive Selection
Blog # 2 Why is fossil record hard to interpret?
 |
| The Fossil of a Moth |
It is hard to interpret fossils because there are so many gaps in fossil records due to the size of the earth, and the difficulty of finding every revolutionary link. When you find dramatically evolved fossils it is very difficult to determine how they evolved to the current population.Gaps in fossils also make it harder to theorize how the fossil evolved to its current population.
Blog #1
Why is evolution a theory and not a law?
A scientific theory summarizes a hypothesis or group of hypotheses that have been supported with repeated testing.
A Law generalizes a body of observations. At the time it is made, no exceptions have been found to a law. Scientific Laws explain things, but they do not describe them.
Evolution is considered a theory and not a law because overtime a species is changing to adapt to its lifestyle. Evolution is based on Natural Selection. It is a theory because it can not be proven or dis-proven.
