Muddiest Point

Hi guys, it's Eunice L.
For my muddiest point, I'm confused about what the function of root hairs are. How do they help the root?

Scribe:Evidence Revolution

Hey guys, it's Eunice L.
Today, we reviewed Darwin and Lamarck. Finding similitaries and differences between both of their theories. We then moved onto Evidence Revolution.
HOMOLOGOUS STRUCTURES
Are similar organisms that adapt to different enivronments in which the functions of appendeages are changed.
ANALOGOUS STRUCTURES
Are different organisms that started to live in similar environments in which the functions of appendages evolved, performing the same function.
VESTIGIAL STRUCTURES
Are structures that continue to remain in organisms but have no fuction. Such as leg bones and the pelvis in snakes and whales.
COMPARATIVE EMBRYOLOGY
By obeserving embryos of organisms, embryos that are similar are found to be more closely related.
BIOCHEMICAL EVIDENCE (MOLECULAR BIOLOGY)
The relationship of amino acids and DNA sequences. Such as how a chimpanzee's and a human's hemoglobin are alike.

Don't forget the Endangered Species Project!

Here are some videos about Evolution
http://www.youtube.com/watch?v=uAZmLYWEPGk
http://www.youtube.com/watch?v=yVqJ_mQazik
http://www.youtube.com/watch?v=qBauu1PyOxw&feature=related
The last one I'm not sure if it has much to do with evolution, but I think it's pretty cool.

Muddiest Point

Hi, it's Eunice Lee.
My muddiest point is the pedigrees, I DON'T UNDERSTAND HOW THEY WORK!
Help!

Canavan Disease

Canavan Disease is a genetic disorder that affect the use and breaking down aspartic acid, or nonessential amino acids that takes part in hormone production and release and in the nervous system. Canavan is caused by a mutation in the gene that lacks the enzyme aspartoacylase (ASPA), which breaks down a chemical in the brain called N-acetylaspartic (NAA). This chemical destroys myelin, fat that surrounds the white matter of the brain containing nerve fibers. Both parents have to be carriers in order for their offspring to be infected with the disease.

Symptoms are:

• Deficieny in motor developement


• Struggles in feeding


• Weak or stiff muscle tone


• Abscence of head control

Other disabilities such as blindness, paralysis, loss of hearing, and mental retardation can occur. Canavan Disease can be indentified by a blood test, screening for mutations or absence of the enzyme. Treatment mainly target to ease any symptoms of the disease, but several drugs are being researched. The disease is mostly common among Ashkenazi Jews. One out of four children could be infected with the disease. Infants do not live before 18 months, and children die before the age of 10. But several are able to survive into their teens and twenties.

Muddiest Point

I have trouble with what happens after the macrophage consumes the virus. And how the T cell activates the helper T cells. Help? :(

Cell Cycle

Hey guys, it's Eunice Lee :D


Today in class we searched for phases of Interphase and Mitosis in an onion cell. We also counted how many cells were in different phases!

In Interphase there is the G1, S, and G2 phase.
In G1, the cell does most of it's growing.
In S-phase, the DNA is replicated and there is twice as much DNA.
In G2, organelles are produced and the cell prepares for the M phase, or Mitosis.

In Mitosis there is Prophase, Metaphase, Anaphase, and Telophase.
Prophase is the longest phase, the nucleus condenses and the chromosomes can be seen. Then, the spindle starts forming.
Metaphase is the shortest phase, the chromosomes gather in the center of the cell and line up. The middle of the chromosome is the centromere which are connected to spindle fibers.
Anaphase, the chromosomes are separated and move to the ends of the cell by the spindle fibers.
Telophase, the chromosomes spread out and the nucleolus starts to form in the cell.

Also remember to post your Muddiest Point by MIDNIGHT!
And Comment on a post before MONDAY BY MIDNIGHT!

Have fun at Homecoming :)

Next Scribe is Kara

Muddiest Point

Hi, Eunice Lee here.
I think my muddiest point is Osmosis. I don't understand it completely, any help? :(