Muddiest Point!

Hey guys! so my muddiest point is what is an EEG (electroencephalogram)? Thanks!

muddiest point!

hi so my mudiest point is what is the importance of cross vs. self pollenation. Thanks!

Muddiest Point!

my muddiest point is about what a taxa is. thanks!

how does it impact evolution????

hey its jessie and im wondering how photosynthesis, aerobic respiration and sexual respiration impacted evolution.

Scribe post:

Hey its Jessie.

In class today we reviewed the blog post from yesterday (homologous structures, analogous structures, vestigial stractures, comparative embryology and molecular biology) and talked about GENETIC VARIATION, GENETIC DRIFT and SPECIATION.

GENETIC VARIATION:

-the change in frequency of allels due to natural selection

GENETIC DRIFT:

-the change in gene pools of a small population due to change(wind blew them away, fire, hurricane,ect....)

SPECIATION:

-when species develope into new species (NEEDED- reproductive isolation)

we also measured the legs of dead grasshopers, YUCK! and compleated a lab.

Muddiest Point!

For my muddiest point, I dont know what the negative and positive feedback loop are. I know what the feedback system is but I dont know if there is a difference from that and the feedback loop. And if they are the same thing, what makes it postive and negative. thanks!

Muddiest Point!

my muddiest point is the difference between incomplete dominance and codominance. thnaks!

Hi it's Jessie. My genetic disease is Maple Syrup Urine Disease. Maple Syrup Urine Disease is a mutation of the BDKDHA gene on chromosome nineteen. This mutation enables the body to break down leucine, isoleucine, and valine, amino acids. These acids are used to make proteins, but when not being used they a

re broken down or recycled. This is done by 6 proteins working together. They form a complex called branched-chain alpha-ketoacid dehydrogenase or BCKD. If a person has Maple Syrup Urine Disease, they are missing one of the six proteins needed in BCKD. This causes levels of leucine, isoleucine, and valine to become dangerously high and rapidly kill brian cells or cause death if left untreated. Maple Syrup Urine Disease has an autosomal recessive inheritance, meaning you need two of the defective genes to get Maple Syrup Urine Disease.

Because the disease is so severe a person who has it will not live past there first few month of life. All people are diagnosed with Maple Syrup Urine Disease are diagnosed as a baby. The symptoms are loss of appetite, fussiness and sweet smelling urine. If these symptoms occur a blood sample is taken from the

baby and analyzed, but some hospitals do this within 24 hours after the birth. If high levels of leucine are present the baby is put on a special baby formula that does not contain the amino acids. That person then must stay on a special diet for the rest of their lives. If levels of leucine, isoleucine, and valine still get to high, patients can be treated with intravenous solution, given through a vein. This helps the body use up the extra leucine, isoleucine, and valine.

Maple Syrup Urine Disease is extremely rare. Only 1 in 180,000 babies are born with Maple Syrup Urine Disease. Although this disease is rare, in the Mennonites in Pennsylvania, 1 in 176 babies is born with Maple Syrup Urine Disease. Also, in Ashkenazi Jews, 1 in 81 babies os born with Maple Syrup Urine Disease.

If not diagnosed early enough the baby will die within a few mouths. If diagnosed though, the person can have a normal life span if amino acid levels are kept under control.

Obligate and faculative what?

Hey its Jessie! Im really confused about whats obligate aerobes, obligate anaerobes, and faculative anaerobes are. Can some one please explain that for me? Also whats the diference between them? Thanks!

Metaphase, Anaphase and confusion. O MY!

What is the metaphase and anaphase? arnt they kind of the same thing?

Need Help!

hi. its jessie.

My muddiest point is exponential and logistical growth. Also the factors that limit population growth (density-dependent factors and desity-independed factors).

thanks!

Reflection on Friday 9/9/11

Hey its Jessie. In class on Friday we took notes on energy pyramids. Energy pyramids show how energy is lost from producers to tertiary consumers, or third-level consumers. as you move from up from each level, the food looses 10% of the energy it had in the previous stage. for example, when grass absorbs sunlight, it gets all the energy(100% of energy is gained). When a rabbit eats the grass, it gets 10% of the energy the grass made. When a snake eats the rabbit, the snake gets 1% of the energy the rabbit ate. when a hawk eats the snake, it gets 0.1% of the energy the snake ate.

Also in class we checked on the growth of our duckweed. Before we looked at our duckweed, our teacher inferred that the growth light above our duckweed was too hot and frying our duckweed. My group checked our Duckweed sample and saw that it was dry and the other organism in with our sample, Hornweed, appeared to be dead. My group decided to leave a sample of hornweed and Duckweed by the window over the weekend to see how the new amount of light affected the growth. we counted that there were 45 fronds of duckweed in our bowl which means there are 8 more fronds then two days ago.

the next scribe is: Rachie

Unit 1 Reflection

Hi its Jessie. In unit one, our class learned how to use microscopes and about the scientific method. We also counted vacuoles in Tetrahymena thermophila and experimented on the effect temperature has on jumping beans.

Im so happy we got to use microscopes in biology this unit. I really like using them and benefited from learning how to correctly operate them. Also, looking at the Tetrahymena thermophila under them was so awesome!

We learned about independent variables, dependent variables, controlled variables, control group, qualitative variables, quantitative variables and making observations and inferences. We even learned how to organize an experiment! Using a hot plate with warm water on it and a bowl of ice water, my group found how temperature effects the movement of jumping beans. Overall, I learned a lot this unit and I am looking forward to the next one!

Hi!

Hi i'm Jessie. Something interesing about me is i had ACL and Meniscis reapair surgury over the summer. I tore it last February and over the summer i finally got it repaired. ACL stands for Anterior Ligament and the Meniscis is cartilage. It stops your shin bone going on to the knee and helps stableize when you twist. Its also more likely for a girl to tare there ACL then a guy to.

Somethings im looking forward to this year is making new friends and spring sports.

Something im not looking foward to this year is all the homework and not being able to hang out with my friends all day, everday.