Scribe! 1/31

Hi! So today in class we started off class by

checking in our "Picture This!" assignment and also our UP page 26. Along with that, we got a new stamp sheet and received two rainbow stamps.

Then we started talking about Darwin Vs. Lamarck. We determined that these are some very important facts to know, and will help with your understanding on the different theories of Darwin and Lamarck!

Darwin

- There is a struggle for existence

among organisms.

-There is a tendency toward

overproduction in nature.

-Conducted most of his research

in the Galapagos Islands.

vs.

Lamarck

-Two mice whose tails had been cut

off should produce offspring with no

tails. (inheritance of acquired characteristics).

-All organisms have an INBORN URGE

to better themselves and become more

fit for their environments; thus birds

developed wings because of this urge.

We answered these questions^ on page 13 in the UP packet; for more practice go there and answer more of those questions! Also, for more help on Lamarck/Darwin, a great recourse is the textbook, and also look through this powerpoint for more review!

Evolution part I

View more presentations from Jmason1

After our short review on Lamarck and Darwin, we took a quiz on a reading we did the other day. This quiz did not count, but could be very helpful to study off of. The quiz was on:

Homologous Structures

Comparative Embryology

Molecular Biology

Analogous Structures

Vestigial Structures

^^^^^^^Example of homologous structures

^^^^^^^Example of comparative embryology

^^^^^^^Example of analogous structures

^^^^^^^Example of vestigial structures

Homologous Structures- As similar organisms adapt to different environments, the function of their appendages changed.

Comparative Embryology- Examining the embryos of organisms; Organisims with similar embryos are thought to be more closely related.

Molecular Biology- Comparison of the amino acid sequences

Analogous Structures- Different organisms began living in similar environments, their appendages involved to preform the same function.

Vestigial Structures- Structures which remain in organisms but have no obvious function.

Tonight's homework is to:

• Finish lab 38

The next scribe is...........Kasia!

EXTRA CREDIT!!!

Click here to watch the recent segment about the hunting of endangered species in Texas.

For extra credit, post a comment to this post expressing your response and opinion on the story. The quality of your response will determine how much extra credit you get! This opportunity will be limited to the first 4 people in your class to respond.

Scribe - 1/26

Hey everyone! Today in class we began with getting our Double Bubble
maps back. We discussed the main points of Darwin vs. Lamarck.

Then we talked about today's lab Breakfast for the Birds. The materials needed for
this lab were:

• pliers
• forceps
• slotted spoon
• staple remover
• 4 paper cups
• colored pencils
• graph paper
• stapler

In this lab, there were five stations that had different types of "food". The "food" was rice, foam,
sunflower seeds, staples, and rubber bands. In order to eat this food, we had a
beak (utensil). We used pliers, forceps, large spoons, and staple removers to
eat as much of the food as we could.

We recorded our data in the table provided, and some of the
beaks worked better than others for eating certain foods.
Finally, we have to graph our data on a bar graph. Make sure to make a key for
each of the environments!

Tonight's homework is to:

• Finish UP 4-8
• read 16.4 with the pink sheet
• TV Ad

Don't forget - tomorrow is a Bio Day!

Scribe! 1/25

Hey guys! So today in class we began with handing in our Double Bubble Maps on Darwin vs. Lamark. Then we discussed on how the Natural Selection Lab worked and how we were going to do it. *Just incase you guys didn't get the homework it is to finish the Natural Selection Lab, go see Mrs. Stein to get a homework pass if you haven't already, and that the Project on the endangered species is due February 28th.

So this lab is about natural selection and how it is about how organisms vary in their characteristics and how some organisms reproduce and survive better than others. The purpose of the lab is to reinforce the concept of how selection works in a demonstration. Here are the steps to this lab:

1. Work as a lab group of four

2. Spread the piece of fabric out on your lab table

3. Select two members of your group to act as predators

4. The two predators should turn away while the other group member distribute ten chips of each color randomly on the cloth.

5. After 100 chips(prey population) have been placed on the cloth, the predators begin attacking. Each of the two predators removes 40 chips, on at a time(take the first chip that catches your eye, do not just grab anything.) Predators should turn away from the cloth each time they take a chip, so as not to spot more than one chip at a time. TAKE ONLY THE FIRST CHIP YOU SEE!

6. The observers should count the prey as each of the predators removes 40 chips.

7. When 80 chips have been removed, collect the 20 remaining on the cloth.

8. Record the number of chips of each color that survived on the provided data table

9. Now allow the population of survivors to reproduce by adding four chips of the same color for every chip that remains from the original population.

10. Repeat the above procedure for the second and third generations and record your results pin the same data table. The same predators should be used throughout the exercise.

11. Answer the following questions on the data table

THE CHART OUR GROUP CAME UP WITH IS AT THE TOP OF THE PAGE!

The other picture is also at the top of the page

THE NEXT SCRIBE WILL BE KAITLYN!

Scribe 1/24/12

Hi guys! Today in class we talked more about evolution and continued watching the movie we started yesterday. For homework, we have to do the double bubble map comparing/contrasting Darwin and Lamark's theories on evolution. Also, we have to read sections 16.1-16.3. Lastly, we have to start working on finding a group and a topic for the project due February 28!

Some of the important topics we discussed today were:

• Variation- many of the organisms Darwin observed were similar but differed from island to island. He concluded some organisms were similar because they all descended from a common ancestor but developed differently to suit the environment they lived in

• Natural selection- how organisms adapt to their environment in order to survive and pass their genes on to the next generation. Also, the environment determines which characteristics are beneficial to different organisms.

• The finches in the movie exhibited natural selection especially in their beaks
• there are two sizes of beaks- large and small
• during a year when there were smaller seeds, the finches with smaller beaks had a larger survival rate because their beak size was most efficient to eat the seeds.
• the next year, there would be more finches with smaller beaks because there were more finches with small beaks the year before to produce offspring with small beaks
• if during another year there were more seeds that were larger, the finches with larger beaks had a better chance of survival because their beak size best suited eating larger seeds

SYDNEY WILL BE THE NEXT SCRIBE

SCRIBE 1/23/12

Scribe 1/23/12

Today in class we talked about the theory of evolution. Evolution is how and in what ways living organisms have evolved over the history of the earth. The most important concept of evolution is that all living organisms have evolved from a common ancestor. Evolution did not occur overnight, it took millions and millions for evolution to occur for all organisms.

            Organisms evolve in order to benefit themselves. For example, Darwin’s Finches all have different beaks and body sizes in order to help them feed. When Charles Darwin, at the age of 22, came to the Galapagos Islands in order to observe the species in the diverse islands, he was unimpressed. The animals were not exiting; the land iguanas and tortoises were slow and not amusing. The landscape was barren with dormant volcano’s and little vegetation. After observing the tortoises for a longer period of time, Darwin realized that the tortoises from one island had different shaped shells than tortoises from other islands. This observation led to the idea of Natural Selection. Natural Selection is the idea that species evolve in order to become better suited for their environments. A great example of Natural Selection is Darwin’s Finches. Contrary to common belief, Darwin paid little attention to the little birds that would run around his feet while he spent his time in the islands. The small birds differ from island to island mostly based on how they got to their food. Some birds with larger beaks and bodies would eat larger nuts harder to get to while birds from another island with thinner beaks would eat smaller seeds in larger quantities.  

The theory of evolution has not been proven, but there is a lot of evidence that support the theory. Darwin was the first to discover evidence that supports the theory of evolution. Even though evolution is a controversial theory that has many people on both sides of the argument, those on the opposing side cannot deny the evidence of the theory.

2nd Semester! Wooohooo!

Welcome Back!

As 2nd semester gets underway, I encourage you to take a moment to reflect on first semester. If you would like to earn a homework pass, come visit me in the next week and be prepare to answer these questions!

1. Do you feel like the grade you got this semester was the grade you earned? Why?

2. What were you most proud of from 1st semester?

3. What disappointed you most about your performance from 1st semester?

4. What goals have you set for yourself for 3rd quarter/2nd semester?

5. What will you do to achieve those goals?

6. What can I (Mrs. Stein) do to help you?

I look forward to speaking with each of you about how to make this a successful semester!

The first scribe for second semester will be SEAN!

muddiest points

im confused about what a zygote is and what it has to do with the reproduction system

janie kahans muddiest point

my muddiest point is that i dont understand negative feedback! help!

Muddiest Point

Hey i'm confused on the different hormones and what they exactly do, espesially progesterone. Also, I am a bit confused on what all the glands are and what hormones they release.

Muddiest Point!

What i don't understand is what is the hypothalamus is and what it does to help the menstruation process. Help is needed thank you.

Muddiest Point

hey guys! I'm struggling with the hormones, and what roles the play. Like FSH and LH, what exactly do they do?

thanks!

Muddiest Point

Hey guys! so for my muddiest point, i am having trouble understanding what diagram D shows on the diagram of the menstrual cycle. i understand what it is showing but i dont understand why it is the way it is. If anyone could help me that would be great.
Thanks, Kelli

Muddiest Point

Hey! I don't understand what the feedback mechanism is and what positive and negative feedback is. Can somebody please help me?

-Thanks, Tanya P

Muddiest Point!

I was reading through the objectives sheet and it says something about secondary sex characteristics, if you could please tell me what that is that would be great! Also, If you could please tell me the what exactly each hormone (LH, FSH, estrogen, progesterone) does, because I'm getting really confused as to what affects what and what secretes what. I hope this isn't too much, and you can do either question. Thanks!

-Christina P

Muddiest Point

Hi guys! so i really do not get what Embryonic Development is with the 4 different types. i don't understand what it's for and what the 4 different ones do. That whole area kind of confuses me. If someone could just clear it up for me that'd be great thanks!

Muddiest Point

Hey guys, I'm kinda confused on when the zygote actually forms in the menstral cycle. I understand the other parts, but this is still a little unclear. If someone could help that would be awesome! Thanks

Muddiest Point!

Hey everyone!

So I don't really understand very clearly what a blastocyst is and why it's so important.

If someone could help me out that'd be great!

Thanks!!

Scribe January 9th

Hello everyone!

Today in class we mainly talked about the menstrual cycle. Here are some of the notes I took:

Hypothalamus Gland- regulates the secretion of the pituarty gland

Then the Pituitary Gland relapses FSH and LH.

The FSH and LH then stimulate the ovary to produce Estrogen and Progesterone.

WHEN ESTROGEN LEVELS ARE LOW THE HYPOTHALMUS SIMULATES THE PITUITA

RY Gland AGAIN, THIS IS THE PROCESS OF FEEDBACK!

The chart to the side is basically: What leads to the production of what?

Back tracking a bit: When the egg gets released, the corpus lutem is left over. The corpus lutem is the remains of the follicle. The CL secrets the hormones estrogen and mostly progesterone.

Why do we care about the uterine lining?

The egg, if fertilized will attach to the lining.

Contraception:

-Preventing the union of egg and sperm.

Barrier Method:

-Condoms

-Diaphragm

-Vasectomy

Chemical Methods: (prevents gamete formation or kills gametes)

-Pill

-IUD

-Spermicide

Behavioral Changes in Sexual practices:

-Abstinence

-Rhythm

-Withdrawal

Fertilization occurs in the oviduct

-Zygote- fertilized egg

Cell Division begins

- Embryo -1 cell

- Morula-solid ball of 64 cells

- Blastocyst- hollow ball of cells

Have fun!

Muddiest Point

Hey guys,

I am confused on the same thing everyone else is, the feedback mechanisms and also the hypothalamus gland and what it does.

Thanks

Muddiest Points!

Hey guys!

I was reading and looking through the Muddiest Points to comment and I noticed a lot of people asked about "feedback mechanism", "negative feedback", and "positive feedback". I think I know what they are, but I'm not at that point where I'm confident enough to help others with it. It would be very helpful if someone can explain it. Also, I'm still confused about FSH and LH hormones. It would be great if someone explained what they are and what they do.

Thanks so much!!! :)

Muddiest Point

Hey guys, so I don't understnad what Mrs. Stein was explaining in class on friday about the cycle. It was like hypothalamus gland gives to the pituitary gland and that gives to something else. I did'nt understand the concept of the cycle and how it worked. If someone could help that would be grand!

Muddiest Point!

Hey guys. So I've been confused about the difference in the menstrual cycle when there is a zygote and when there isn't. Is there anything different or what are somethings that are the same?Thanks!

Muddiest Point

Hey guys. This is kind of like what everyone else is saying, but i don't really understand the positive/negative feedback. i also don't understand what the hypothalamus gland is and what it does. Thanks:)

Muddiest Point

Hello everyone,
         Im having troubles understanding the negative and positive feedback loop (in the context of hormones and the menstrual cycle). Thanks!

Muddiest Point

Hey Guys!

I am having trouble understanding how feedback works. Can someone please explain this to me? Thanks!

Muddiest Point!

Hi Everyone,

Please explain the three embryonic layers, ectoderm, mesoderm, and endoderm and what organs and systems develop from these layers.

Thanks,

Sonya A.

Muddiest Point!

What I'm confused about FSH and LH. Does a certain one signal the ovaries to secrete estrogen and the other one to secrete progesterone, or do they both signal the ovaries to secrete either hormone?

Thanks

Muddiest Point

Hi!
My Muddiest Point is distinguishing the amnion and chorion. What is the difference between the two?
Also, what are the Negative/Positive Feedback Loops? I was looking through the objectives, and I didn't recognize some of these things..

Thanks!

Friday, January 6th 2012

We started off this class by reviewing the homework from last night. Then we started lab 31.

Here are some of the things that we reviewed:

Hormone: protein travels through blood system to communicate with glands

Pituitary Gland:

-secretes 9 hormones

-regulates other endocrine glands

-tells other glands to release what hormone

Hyptothalamus Gland:

-integrates the endocrine and nervous systems

-controls pituitary gland

Control of the Endocrine System:

-regulated by a feedback mechanism

-negative- last signal inhibits the first

-positive- last signal stimulates the first

Menstrual Cycle:

-average of 28 days

-body prepares for pregnancy

-occurs from puberty until menopause

http://www.youtube.com/watch?v=8_rfZ_qj1z4

http://www.youtube.com/watch?v=pQ4QOQdnifk

Homework:

-lab 31

-read 34.4 with flow map on fertilization, development, and pregnancy

-UP 20-21

Next scribe will be: Janie!

Scribe 1/5/12

Today in class we discussed the structures of the reproductive systems, and the effects of puberty in both the male and female body.

Male reproductive system:

Female reproductive system:

Male testes produce testosterone the male hormone that creates many changes in the body.

-hair growth in new places

-larynx enlarges causing deepened voice

-broaden shoulders

Female ovaries produce estrogen the female hormone this causes.

-breast development

-widened hips

-menstruation

The menstrual cycle occurs about every month and can last for a couple days. During the menstrual cycle an egg leaves the ovaries, this is called ovulation, and the uterine lining thickens.

Homework:

Begin Lab 31

Hormones reading check

MAKENZIE is next scribe

Scribe 1/4/12

In class today we went over the meanings of external and internal fertilization, external and internal development, and the goals of the female and male reproductive systems.

External Fertilization: Sperm and Egg meet outside of the body.

Disadvantages: Sperm and Egg may never meet, and they could be eaten.

Internal Fertilization: Sperm and Egg meet outside of the body.

Disadvantages: Sperm may not find an egg, and it limits the amount of offspring.

External Development: Sperm and Egg develop outside.

Disadvantages: May not survive, could be eaten.

Internal Development: Sperm and Egg develop inside.

Disadvantages: Pregnancy is demanding.

Goals of the male reproduction system:

- Create Sperm (occurs in the testes).

- Transport Sperm- Provide Sperm with nutrients (occurs in vas deferens).

- Sperm connect with egg (occurs in penis).

Goals of the female reproduction system:

- Create egg (occurs in ovaries).

- Transport eggs, provide meeting point with sperm (occurs in fallopian tubes).

- Makes a suitable environment for embryo and fetus (occurs in uterus).

- Giving Birth.

Homework:

-Read 34.3

- UP 7-10

Page 7- label and write definitions/ functions

Page 8- review

Page 9- label and write definitions/functions

Page 10- label only

-USE TEXTBOOKS AND MOODLE LINKS

TAYLOR is the next scribe!