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monet shimura

on 5 February 2015

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Transcript of Meiosis

Generally know as "resting stage" between meiosis I and meiosis II
Cell divides in two
Cell will grow and make proteins, but there will be no replication of DNA in this stage
Metaphase I
Prophase II
Nucleolus and nuclear membrane disappears
Second stage of meiotic division is initiated
Spindle fibres
Individual chromosomes will attach to spindle fibres
Telophase II
Half of complete set of chromosome is at each pole of the cell; one chromosome for each pair
During this time spindle fibres disappear
Nucleolus appears within each nucleus and nuclear membrane also forms
Metaphase II
X-shaped chromosomes form a single line at the equator
- BC Science 9 Textbook


- Google Images

Meiosis II
By Calisty Pun
Roger Hsieh
Monet Shimura

So... What is meiosis?
Meiosis is a type of cell division which reduces half the number of chromosomes as body cells for the
The gametes combine to make this new cell called a
. The cell undergoes repeated mitosis and cell division, which then grows into an
. After a few other steps and stuff... This cell eventually turns into YOU.
However, we don't want
46 chromosomes from both your mother and father. We want a
so that we get a genetic diversity.
Why is meiosis helpful and how exactly does it help us? :/ hm..
There are
2 different
stages of
Meiosis I
Prophase I
Anaphase II
Nucleolus and the nuclear membrane disappears
Spindle fibres
Homologous chromosomes
in nucleus starts to pair up and split into chromatids
Non-sister chromatids exchange genetic materials a.k.a.

crossing over
The homologous chromosome pairs get lined up at the equator by the
spindle fibres
Anaphase I
During this time, the spindle fibres contract and shortens.
The homologous chromosomes that are attached to centromeres separate and are pulled to the other side of the pole.
This thing

Crossing over
is when the parts of the non-sister chromatids "cross over" and exchange parts of DNA. Now the chromosome has picked up new genetic information and can make
numbers of genetic possibilities for just one gamete!
Telophase I
One chromosome from each pair of homologous pair is at each pole of the cell
During this stage the spiral fibres disappear
The nucleolus appears within each nucleus
Nuclear membrane forms
The spindle fibres contract and shorten
The sister chromatids separate and are pulled to the opposite pole by the spindle
Cell divides into two with a total of four daughter cells which are not genetically identical to the parent cells.
Scarred for Life

The rest of the slides are not part of the presentation, but only for decoration purposes.
Full transcript