Biology : Meiosis - cell division

[nw5111]

my class was laughing at 1:57

[sharyahshay]

That is creative

[rokyn2000]

Wiggle-wiggle-wiggle!

[1993shamim]

very nice i like it very much

[MsCutencrazy]

its funny at 1:33....................

[GODelusional]

Hmm yeah I remember this in biology when the class was learning Mitosis our Mnemonic Device on knowing the exact order was...

I - Interphase

Put - Prophase

My - Metaphase

Apples - Anaphase

Together - Telophase

Its weird but it helps remember it.

[1993shamim]

@GODelusional i really love it

thanks

[supersaijen]

It was ok and cool but y cut off the good part! ^U^

[italbello6t9]

To clear up anything said with regards to the amount of chromosomes in each cell.

Definitions:

C - concentration of DNA in cell

N - number of chromosomes within the cell, with N = 23

----

We start out with 2n, and 2c, because each cell has a mother and father copy

Then the DNA is replicated giving us 4c, BUT still only 2n because they pair up creating 2 sister chromatid comprising 1 chromosome

Then they split, giving each cell 1n, but only 2c

Then they split again giving each cell 1n and 1c

[italbello6t9]

@italbello6t9 It's all about what the spindles are pulling on that determines the N

In the first division, the whole chromosomes (comprised of both sister chromatids) go to either cell, this is why we go from 2n, to 1n

In the second division, the sister chromatids now split, this is why we remain at 1n, but we now go from 2c to 1c

Hopefully this clears everything up, I know it's hard to articulate with only a limited number of characters.

[Redukas123]

meiosis only for adults

[Dragan572]

@Redukas123 and teens

[Dragan572]

@Redukas123 and teenagers

[jacobcheese]

I

Piss

Myself

At

Tesco

[bubblekisses143]

is the video cut short?

[h242e2]

I Peed on A MaT:

Interphase

Prophase

Anaphase

Metaphase

Telophase ;)

[elainaaag]

@h242e2 metaphase is actually before anaphase. nice way to remember, i just didnt want you to get used to thinking of it in the wrong order! :]

[mufasatings]

orgy at 1:37!

[Wolfforlunch]

240p...no I'm not gonna say it.

[silverpooh24]

@ononkkp2d Laugh out Loud

[rotateaxis]

i understood everything thanks to this video! in the other vids they don't say the part at 2:00 which makes the whole thing a lot less complicated

[jacklee154]

Stop and look 1:33

Thank you for information, ononkkp2d, I really mean it.

lol.....hahahahhahaa

really, it's so funnay!

[Jonathan12319]

how does it start with 46 chromosomes?

[Jonathan12319]

i dont get it if it starts with 46 then divides it would have 23 then it divieds again it would have 11.5 that doesnt make sense im doind something wrong someone tell me

[vidsforcheese]

@Jonathan12319 it starts with 46, and then theres 23. Those 23 are still in the 'X' shape of chromosomes. (so two chromatids) When it splits apart again, its just like in mitosis when they split apart the chromosomes. So instead of an 'X' shaped chromosome with two chromatids, you get one chromosome with only one chromatid

Sorry if that was a little confusing :$

[naomibubbles17]

@Jonathan12319 the first diploid cell has 46 chromosomes that are duplicated into sister chromatids. those sister chromatids are put into homologous pairs (23 pairs). in meiosis I, the homologous pairs are separated so that each haploid daughter cell has only 23 sister chromatids now. then in meiosis II, they are separated at their centromere so that each of the 4 haploid cells in the end have 23 chromosomes, because the divided sister chromatids are still considered to be one chromosome.

[jhoda0697]

Very interesting video!!! Very easy to understand!!!

[MrKrumpmaster]

7 people majored in physics!

[Paraclete333]

It's so interesting that we are learning exactly what the video shows, and I understood 100% what se said, even though my primary language is Albanian.

[BryanGallardo1995]

I hate Ms. Stewart! >:O

[ononkkp2d]

Sorry,but I can't stop laughing at 1:33

[gmoneycashmoney23]

@ononkkp2d YOURE SUCH A FUCKING PERVERT

[BiggerThinking1]

@ononkkp2d thats coz u have a dirty mind!

[Survivor13100]

@ononkkp2d how is that funny? O_o

[jimbojones091]

Lol the swimmy sperms.

[MrSniperscope]

i hate the way she says ''chromosome''

[ilikemoola]

Great video; so helpful. XD at 1:30 looks like homologous chromosomes having sex.

[theGUYwhoSAYShi162]

look at 1:30 lol looks weird XD

[hamasaful]

everybody is watching with one thought in his mind : i was out to the world by that way

[ellomore]

i spent a year learning about chromosomes and i had no idea what they were. right now, the night before my finals, i watch this video and understand EVERYTHING. THANK YOU!!!

[qwerty200ful]

@ellomore I got finals as well. High five bro!

[pixelated111]

Am I the only one who thinks 1:40 looks really funny?

[emily406808]

P-Prepare (by chromosomes condensing and copying)

M-Middle (line up in)

A-Apart (pulled)

T-Two Cells Created (haploid)

[maddywoo13]

@emily406808 I love you, thank you so much

[dindanio1]

@emily406808 you are a brillant.Couldn't simplify it anymore.

[ExaltedCinema]

god i hate ap biology

[hamasaful]

@ExaltedCinema then what do u love if u hate ap biology ??????

[SuperLondon1994]

wonderful

thnxs

[dagonlord32002]

this is not when they separate they are not homologous anymore!! they are already recombined. Am i wrong?

[MrSuperunicycle]

@dagonlord32002 your right

[thamer7A7]

AWESOME!

[imnotahater101]

does anyone else have a problem processing the stages of meisosis? i kno....PMAT ...but i have a problem Knowing what they do...

[vjnitin19]

very helpful

[iknryne]

thanks...i had understand about meiosis now...tengs

[mithilag]

can we have the link to the rest of this video? it's a wonderful demo/representation

[Norfeldt]

@mithilag mybiology [DOT] com/bioflix.html

[deavl10]

ORGYYY!!!!

[sandeep88214]

its excellent thanks!

[FOBIANDREWS]

It was great. It helped me in understanding meiosis even when i knew nothing about meiosis.

[EranFuchsDesigns]

thhhnx!



[Newtonnn10]

thanks alot!

[Skakkista]

very usefull! :)

[Glenny41]

Very helpful

[shansh6]

Now i'm understand what is meiosis :) I'm sso happy

[franktze]

This is a very good video showing the whole process very very clearly

[dyonnegalata]

yes  yes yes..

[JackinBig]

just to check my understanding: a normal cell has 46 strands of DNA, one paternal, one maternal, they make 23 homologous pairs that look like / /. After the DNA has multiplied, so you have twice the genetic information, it looks like XX. Then they are pulled apart in M1 to leave X X. And again during M2 to leave / / / / in four different Gamete cells?

[JackinBig]

just to check my understanding: a normal cell has 46 strands of DNA, one paternal, one maternal, they make 23 homologous pairs that look like / /. After the DNA has multiplied, so you have twice the genetic information, it looks like XX. Then they are pulled apart in M1 to leave X X. And again during M2 to leave / / / / in four different Gamete cells?

[grandsize56]

tugofwar :)

[johnybrovo2008]

I got a test today wish me luck.

[XxXdragurlifeXxX]

Omg the last part scared the shit out of me

[bashfulmemo4088]

im very confuse in the numbers of chromosom how many at the beginig and how many in the end????????????????????????? TT_TT

[fourthzane]

lmao looked like the chromosomes were humping eachother!!!

[alrambella]

@kassproductions no haploid means it has 23 chromosomes, when they divide in anaphase II it means the sister chromatids are dividing, because each chromosome has 2 sister chromatids ... I don't know if you understood me but... In Meiosis II you have two haploid cells duplicated and they divide and you get 4 haploid cells

[Dawnnxo]

@kassproductions: Hi, I got this kind of confused as well. I think it goes like this.

The chromatid are in a diffuse form like this | ... then they duplicate in interphase so they look like this X.. they are now made up of TWO chromatids. Remember, one chromatid is STILL considered a chromosome. When the homologous pairs separate, it turns into 23 chromosomes, and then in Meiosis 2, further separation of sister chromatids into 23 chromosomes. Hope that helps, hard to explain without diagrams :P

[sibghatullahdad]

@kassproductions  no then they will divide and have again 23.................

[la12ok]

test today wish me luck. ~.~

[Naturelover765]

hard :P

[Dawnnxo]

What is the S-stage in meiosis?

Thanks in advance.

[alrambella]

@Dawnnxo S- stage means DNA synthesis and chromosome duplication, meiosis involves two cell divisions, chromosome duplication, which is associated with DNA synthesis occurs prior to the first of this divisions

[Dawnnxo]

@alrambella: thanks!

[wannabebrittishgirls]

im in 7th grade and its hard to under stand this video and i need this kind of info. for a major project due monday :/ and i dont understand it

[OmGiTz4Shotzz]

@wannabebrittishgirls Wikipedia is your friend.

[sciencefreakability]

hope it can help me in my test tomorrow

[XxwarriorwolvesxX]

soooooooo thats were babys come from XD

[MysticalFlyingMonkey]

Omg, thank you so much. Visualising this really helped me understand :)

I have no idea why i couldn't understand this at all xD

[DevilDman]

1 person didn't understand this video and failed his test.

[MissPheonix1]

@DevilDman or her test

[izyan120]

@DevilDman You've just made my day with that comment. xD

[DevilDman]

@izyan120 lol no problem

[PorroFirst]

@DevilDman I think more than 1.. I'm not getting it.

[DevilDman]

@PorroFirst At the time when it came out and I posted the comment, it was one person lol

[TheMordyS]

@DevilDman That number has to be updated to 3

[LucasPestana]

@DevilDman Actually, now there are four! Wow!

[DevilDman]

@LucasPestana lol what can i say, there a lot of dumb people out there XD

[edenhunter]

@DevilDman make it 7

[gunnershane21]

i love this so much.. ur sexy

[drazfam]

this video helped a lot! thank you :) i'ma geta A on meehh test.

[sikhigirl100]

this video helps a lot! thanks!

[gbyortiz]

mhh, actually mitosis and meiosis starts with a 4n cell, because of the previos S stage of cell cycle. Could anyone explain that? Why is it that when we watch a karyotype of somatic cells we can see a pair of each chromosome (1 pair of 21 by example) and that represents a picture of the metaphase, wich means it is 4n????? i mean im confused

[ridewithluke]

It very fun that a lot of detailled animation are available for education. This video show some cross-over during the division.

[streetzboxa]

wer she says mother shown in red, father in blue, she should have used other 2 colours, because colour blind people se red as green, or blue, or blue as red. lol, great vid though.

[MiyaviManson]

Helped me a lot :) Thank you!

[20shay02]

great vid! :)

[archimoud]

very nice video. very good animation. gratz