Day 9 February 9 Chapter 5 + 6

8/3/2019 Day 9 February 9 Chapter 5 + 6

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Day 9 February 9 Chapter 5 + 6

Exam 2 2/22

Last time, we talked about cloning so lets talk more in depth about

what it means to duplicate cells.

First, a few clicker questions


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READ 3, 4, 5, 6


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Biologywithtechnology.com

1. The website adds a lot to the class, and I like

having all the resources available tome.

2. I like having the website better than usingSpringboard.

3. I would prefer you to use Springboard

4. I would prefer not to have technology in thisclass at all.


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Amys teaching style

1. I can clearly see Amy and hear her during

lectures

2. I can hear Amy, but I cant see whats goingon

3. I can see whats goingon, but I cant hear

Amy

4. Class is not important, I can get everything I

need from reading the website and my book.


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My grades:

1. I know Imgoing toget a good grade in thisclass, and I earned it by working hard.

2. I know Imgoing toget a good grade in thisclass, because its super easy.

3. I know my grade is going to be passing, and Idont care.

4. Imgoing to fail, this is too hard, I feel totallylost.

5. Imgoing to fail because I could care less.


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The clickers are:

1. Kinda fun, add tomy grade, I like to see other

students answers.

2. It took a while, but I got the hangofit.3. I still dont know how to use my clicker.

4. I want to throw this freaking clicker off a

bridge!!!!


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Is it possible toclone adinosaur? How

could it bedone?


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A chicken dinosaur? Scientists

discover what the bird mighthave look liked in prehistoric

times


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A dinosaur chicken is

1. FREAKING AWESOME!!!

2. Interesting

3. Whatever

4. Holy cow, thats scary!What if the

dinosaur chickens take over theworld?


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We should pursue cloning in animals but

not humans.

1. Strongly agree

2. Agree3. Neutral

4. Disagree

5. Strongly disagree


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Continuity and varietyLectures by Mark Manteuffel, St. Louis Community College; Clicker Questions by Kristen Curran, University of Wisconsin-Whitewater

Chapter 6: Chromosomes and Cell Division


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Bladder Cancer cells


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6.1 Immortal cells can spell

trouble: cell division insickness and health.

Once you are fully grown, do you have just one set of cells

that live as long as you do?


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Telomeres

The telomere is like aprotective cap at theend of the DNA.

Every time a cell

divides, the telomeregets a bit shorter.

(Like a cars odometer)


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At birth, the

telomeres in

most human cells

are long enough

to support about50 cell divisions

Is there a Fountain of Youth?


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How might telomere length be

affected in a cloned animal likeDolly the sheep?

1.Telomeres might be longer thannormal.

2. Telomeres might be shorter thannormal.

3. Telomeres might be of normallength.

4. No telomeres would be present.


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How might telomere length be

affected in a cloned animal likeDolly the sheep?

1.Telomeres might be longer thannormal.

2. Telomeres might be shorter thannormal.

3. Telomeres might be of normallength.

4. No telomeres would be present.


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Cancer

These are cells

that rebuild

theirtelomeres

after each cell

division,

restoring theprotective cap,

never stop

dividing


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Cancer cells are those

wh

ich

h

ave forgottenhow to die.Harold Pinter


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Mitosis has just one purpose:

To enable cells to generate new,genetically identical cells.

There are two different reasons for thisneed:

1. Growth2. Replacement


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Preparation for

Mitosis: TheChromosomesReplicate


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Animal chromosomes are linear.

So why do they look like the letter

X in pictures?


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Sister Chromatids

A chromosome and its identical replicatedcopy, joined at the centromere.


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Tumor Growth

unregulatedcell division


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Cancer cells haveseveral features

that distinguishthem from normalcells, including


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Benign and MalignantTumors


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Why is the treatment for cancer oftenconsidered as bad as the disease?


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6.10 Sexualreproduction

requires specialcells made bymeiosis.


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Meiosis

gametes

diploid

haploid

maintains a stable genome size in aspecies


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Meiosis achievesmore than just areduction in theamount of

genetic materialin gametes.

You have twocopies of everygene!


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Meiosis has two important features:

1. It reduces the amount of geneticmaterial in gametes.

2. It produces gametes that all differ fromeach other with respect to thecombinations of alleles they carry.


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6.11 Sperm and egg are producedby meiosis: the details, step-by-step.

Mitosis occurs almosteverywhere in an animals body.

Meiosis only occurs in one place.Where?

Documents

Day 9 February 9 Chapter 5 + 6