Trevor+U.

=** Biology 122 Wiki Post # 1! October 11th/2013 **= = =

__MITOSIS!!__
What is Mitosis? Mitosis is the process where a single cell divides resulting in generally two identical cells, each containing the same number of chromosomes and genetic content as that of the original cell.

In Mitosis there is four different phases which a cell must go through before the process is completed. The four phases are: Prophase, Metaphase, Anaphase, Telophase.
 * 1st phase: Prophase: formation of paired chromosomes disappearance of nuclear membrane appearance of the achromatic spindle, formation of polar bodies
 * 2nd phase: Metaphase: arrangement of chromosomes in the equatorial plane. Chromosomes separate into exactly similar halves.
 * 3rd phase: Anaphase: the two groups of daughter chromosomes separate and move along the fibres of the central spindle.
 * 4th phase: Telophase two daughter nuclei are formed, the cytoplasm divides, forming two complete daughter cells.

__Picture____s__ These pictures are in order from Prophase, Metaphase, Anaphase, and Telophase this will show you what each phase looks like and how each phase is completed. The description of what exactly is going on in each picture is in my explanation above.



 @http://www.youtube.com/watch?v=C6hn3sA0ip0 This video is great because it explains what mitosis is and how it happens perfectly.
 * __Video:__ **

=__ References: __= @http://www.biology.arizona.edu/cell_bio/tutorials/cell_cycle/cells3.html http://www.cellsalive.com/mitosis.htm @http://www.edupic.net/cells.htm @http://www.biology-online.org/dictionary/Mitosis

__Further Reading:__
@http://www.johnkyrk.com/mitosis.html - This has a great animation of how the cells divide and the different phases. @http://www.youtube.com/watch?v=cvlpmmvB_m4 - This video has a good showing and explanation and great commentary which clearly tells you step by step process. @http://www.life.umd.edu/cbmg/faculty/wolniak/wolniakmitosis.html - This is a great blog/post which in detail of how mitosis works.

@http://library.thinkquest.org/C0118084/Gene/Chromosomal_Inheritance/StagesMitosis.htm - This site has great pictures and descriptions of mitosis and its stages.

=** Biology 122 Wiki Post # 2! November 27th/2013 **=

__Theory of Evolution!__
What exactly is the Theory of Evolution?

The Theory of Evolution is broken down into many different sub-types, but the main theory states the all organisms and every piece of life has been descended from a common ancestor. A great example of this would be dogs. Every single breed of dog can be linked back to the grey wolf. So this would prove Darwin's theory being true because the grey wolf would be the common ancestor to all dogs.

The primary mechanism of change over time is natural selection. This causes changes in the properties/traits of of organisms within lineages from generation to generation.

The Process of Natural Selection Darwin's Process of Natural Selection has four components.


 * Variation - Organisms within populations exhibit individual variation in their appearance and in how they behave. These variations may involve body size, hair color, body markings, or number of offspring. On the other hand, some traits show little to no variation among individuals. For example: The number of eyes in vertebrates.


 * Inheritance Some traits are consistently passed on from parent to offspring. Such traits are heritable, where as other traits are influenced by environmental conditions.


 * High rate of population growth. Most populations have more offspring each year than local resources can support leading to a struggle for resources.


 * Differential survival and reproduction. Individuals possessing traits well suited for the struggle for local resources will contribute more offspring to the next generation.

__ Picture ____ s __ These pictures all have the Theory of Evolution being shown and how it was predicted to be like with humans. The first picture is the evolution of monkeys which we originally were evolving into humans. The second picture is of the skeletons of certain apes and a skeleton of a human which you can see how similar some parts of the skeleton actually are. The third picture is of Lamarck's view on evolution which was how animals evolved which was by using the limb they would evolve to have the necessary limb, the best example of this is in the picture which is the giraffe and its long neck. The fourth picture is of Darwin's natural selection process with his finches and how they have varied between what each finch does.




 * __Video:__ **

media type="custom" key="24576892" This video is a great example of the theory of evolution and how Darwin discovered it. It is nice and simple and explains in great detail on what Darwin did to discover how natural selection happens and how animals evolve over time.

=__ References: __= http://www.darwins-theory-of-evolution.com/ http://germanshepherdplace.com/the-story-of-dog-breeds/ [] []

__Further Reading:__
http://www.statedclearly.com/evolution/ - This website is great because it literally explains evolution so that anyone can understand it. Great for extra information on evolution. http://www.ndsu.edu/pubweb/~mcclean/plsc431/popgen/popgen5.htm - This website is good because it helps explain the process of natural selection if it was not understood at first. [] - This site is great because it has every part of evolution in it in great detail which helps anyone who might be interested on exactly what evolution is. [] - This website works great with the previous because you can see the differences to be able to get even more information on the Theory of Evolution.

=** Biology 122 Wiki Post # 3! JANUARY 24TH/2014 **=

__**Pregnancy**__
What is pregnancy?

Pregnancy is what many women in our world go through to bring a new child into the world. Pregnancy is the development of a fetus in a woman's uterus. This happens through a fairly complex process. Which involves, the release of an egg during ovulation, intercourse between a couple, which leads to the egg becoming fertilized, and then going and developing in the uterus.

Fertilization is not an easy process. Sometimes the sperm will not fertilize an egg, because of the timing of the couple having sex, etc. Most sperms die when they hit a wall in the vagina that has an acid fatal to sperm. Once pregnant, it takes about 9 months before the child is born.

__Pictures__
All the following pictures have to do with pregnancy/fertilization. The first picture shows where the egg travels over the first few days of becoming fertilized and going to the uterus as an embryo. The second one is similar, but shows up to where it developed into a 12 week old fetus. The third shows what it would look like if 2 sperm fertilized to make twins. And finally the last one show sperms attached to an egg, and tells how only one succeeds at fertilizing.





__Video__
media type="custom" key="24942694" Here is an amazing video showing what happens during fertilization. It will show the path the sperm takes and much more.

__Resources__
[] [] [] []

__**Further Readings**__
http://www.babycenter.com/2_inside-pregnancy-fertilization_10354435.bc -This Site is great because it details fertilization, and has a nice video along with it. http://www.whattoexpect.com/pregnancy/your-body/week-3/ovulation-and-fertilization.aspx This is another great site with details about the embryo and the uterus and more. http://www.innerbody.com/image/repo04.html This site is awesome because it describes pregnancy process and has a cool widget for you to look at the process. http://www.plannedparenthood.org/health-topics/pregnancy/how-pregnancy-happens-4252.htm This site shows more on how pregnancy happens.