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Copy of Copy of Microscope Template

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by

Shane Loader

on 11 June 2014

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Transcript of Copy of Copy of Microscope Template

Cell Division -Mitosis
MITOSIS REVIEW
Think about what we been discussing so far about cell division:
But that is not the case!
Most organisms do not reproduce through mitosis - this would result in
IDENTICAL
offspring


Every species has their own specific number of chromosomes;
Dogs have 78 chromosomes, cats have 38, and mice have 40!


Wrap Up
What is the purpose of mitosis?

What type of cells undergo mitosis?

How does the chromosome number change between the parent and daughter cell?

What is a trick to remember the stages of mitosis?


Meiosis allows for diversity in a population!
Meiosis

is the process in which our diploid cells undergo a process to create
HAPLOID
CELLS (half the amount of chromosomes) called
GAMETES
**This occurs in our sex cells**

Review- What is a Chromosome?
A
CHROMOSOME
is a threadlike structure in the nucleus of a cell that contains genetic information that is passed on from one generation to the next
Humans have 46 total chromosomes, or 23
HOMOLOGOUS PAIRS

Humans have
46
chromosomes, or
23
pairs
2N = 46

N = 23

We are
DIPLOID!
Don't forget our plants too!
MEIOSIS
A Koala Bear cell with
16
chromosomes undergoes
MITOSIS
, how many chromosomes will a daughter cell have?

A Koala Bear cell with
16
chromosomes undergoes
MEIOSIS
, how many chromosomes will a daughter cell have?
Koala Bears are actually marsupials, not bears, and are more closely related to opossums and kangaroos
Use the remaining time to complete the Mitosis vs. Meiosis worksheet

You may work with a partner

Turn it in when finished!
WHY DOES THIS NEED TO HAPPEN??
MITOSIS
- What is it, and why do organisms need it?

Organisms all have their own unique
DNA, or genetic code

This code is packaged in the form of
chromosomes

DNA ----> CHROMATIN ------> CHROMOSOMES
MITOSIS

is a process in which DNA is copied an IDENTICAL CELL is made from another cell

Mitosis occurs in our body cells
MAJOR STEPS OF THE CELL CYCLE:
INTERPHASE
PROPHASE
METAPHASE
ANAPHASE
TELOPHASE
CYTOKINESIS




I
P
LAY
M
USIC
A
T
T
HE
C
LUB
Major events of cell division:

Interphase
- DNA is replicated, cell prepares for mitosis
Prophase- DNA (chromatin) condenses to form chromosomes
Metaphase- Chromosomes migrate to cell center
Anaphase - Chromosomes are split apart and move to ends of cell
Telophase- Cell prepares to split
Cytokinesis
- Cell splits into 2, resulting in TWO IDENTICAL CELLS
MITOSIS PLAY-DOH DEMONSTRATION
Wait - so is it CHROMOSOME or CHROMATIN?

CHROMATIN
condenses down to form
CHROMOSOMES
during Mitosis

Chromatin is the DNA + proteins in the nucleus

Prior to Division
2 chromosome organism
Interphase - DNA is replicated
Prophase -

chromatin
condenses and
chromosomes
are formed


Anaphase - Chromosomes split and migrate to opposite sides
Telophase and Cytokinesis- Cell prepares to divide
Metaphase - Chromosomes move to center and prepare to be split apart
CHROMATIN in nucleus
Organisms have a way to make identical copies of their chromosomes and put them in newly formed cells -
but how?
mitosis
Mitosis vs. Meiosis
Meiosis relates to sexual reproduction:

What is an
advantage
for organisms to sexually reproduce?

What would be a
disadvantage
?
Science Starter #2
(Same page as yesterday)
Justify why it is necessary for
chromatin
to condense to a
chromosome
before replication
Full transcript