BLog #4 Semester 2

Blog # 4 Describe the three types of selection: directional, stabilizing and disruptive and give an example of each in your own words.

 Directional selection is a type of natural selection where certain gene is used and more favored. It becomes apparent in each generation and removes mutation from a population.

Stabilizing selection is a type of natural selection where the genetic differences reduced through generations due to a trait that has been more favorable than the reduced genes.

Disruptive selection is the a type of natural selection in which there are two favorite genes and one of them is more favored than the other, resulting into two distinct groups with two distinct features yet from the same ancestry.

Blog #3 Semester 2

Explain what microevolution is? What are the three ways that variation occurs?

Microevolution is evolution, or changes, in gene frequency that responds to a population. The three ways that the variation can occur is through mutation, natural and artifical selection, and genetic drift.

Blog #2 Semester 2

Blog # 2 Why is fossil record hard to interpret?

Many fossils are thousands or million years old.  Some of the fossils are broken and only some parts of the fossil is not damage.  In this case, it is very hard to inerpret the fossils if the fossils is not in one piece.  Sometimes, sand and dust can also damage and cover some parts of the fossils.

Blog #1 Semester 2

Why is evolution a theory and not a law?

 Evolution is the change over time in the proportion of individual organisms differing in one or more inherited traits.  The evolution is a theory because there is not enough information to prove how the evolution started.  No one knows how the first cell in this planet is created.  Therefore, the evolution can only be a theory.

Blog #14

What was you favorite activity/topic this year? Why was it a favorite?



My favorite activity of this year is the chip burning lap.  I like it because we can burn chips and eat the left overs after.  It was very fun except the fact that we burn the chips out in the sun.  It is very HOT!

What was your least favorite? Why?

I think learning about cells is my least favorite topic.  I am not very interested in cells and I don't know much about it.  A lot of the notes on it is hard and I have to try very hard to get it.  Therefore, I think cells is my least favorite topic.

If you could change one thing (Not the amount of homework) what would it be and how would you change it?
I think the points Ms. Malonek gives to my notebook is too high.  When I'm trying to calculate the points, I get very dizzy and crazy because the number is too big.

Blog #13

Blog#13 How has DNA changed how we investigate crimes? What are the two main tests? Describe them

DNA changed the way we investigate because it had helped us find the perpetrator through blood, saliva, hair, fingerprints.  PCR only needs little DNA  and it is very cheaper.  PCR is often used because of its efficiency.  PCR uses repeated regions of the DNA and copies it with another region.  Then, it uses primers to indicate a starting point of where the DNA copying should start.

RFLP requires large amount of DNA that is "fresh".  In RFLP, thousands of cells are collected and then cut in the same place with a restriction enzyme. Next, the cut DNA is sorted by size through a gel which allows smaller pieces of DNA to pass through quicker than the larger pieces of DNA. After, another copy of the gel is used to trap the pieces of DNA which is later on treated with probe. Finally, the sizes and how the DNA is distributed is noted down and repeated for many other people.

Blog #12

Look up Gregor Mendel and his pea plant experiments Why does P1 look all alike and F1 looks very different?

The P1 look similar because they are purebreds and parents.The F2 looks different because they are not a purebreds so they are a mix of genes from the F1 generation, which also looks the same because they are offsprings of the P1, so they have the same amount of genes.