meiosis

[fandanstan]

This is seriously the best video I've seen explaining meiosis. Even better than the most fanciest animations, tbh.

[THEUNKNOWNWANDEREMAN]

Can I get some help? Does sex-cells have two or four Pols? Thanks! 

[NathanQ666]

shit nigga u got the toys and everything

[AdamLlover4life]

helped me with this lab exam tomorrow! Thanks!

[scotty2dadout]

Thumbs up if you looked for this because of finals

[2Ashanti2]

thankkk youu man!! ur amazinggggg

[epsilonian818]

This Video was awesome!!! The Models really help to visualize where the maternal and paternal copies may end up. Thank You.

[DemeterNightmare]

Thank you so much. I'm doing my NAB tomorrow and even although I've studied I've been panicking so badly.

This has helped.

[niruna30]

my teachers totally confused me but i finally get it now! i feel so happy

[darkscurion]

Thank you.

[PsychoUnleashed786]

Brilliant!!!

[12345mshughes]

Maureen, you are an absolute legend. Great teaching, thanks so much.

[MegaMreeves]

WHERE did you find those beads...they are awesome!!

[musicluffler]

@MegaMreeves They're called pop-it beads! We played with them in my class today :)

[poisongaze]

So the chromosomes are 4n when they replicate. Omg, I was wondering about this. THANK YOU!

[hashbashir]

while studying for the USMLE step 1, i had a serious moment where i just could not recall meiosis! and this video was just perfect. great job.

[hussainiabdullahi]

VERY IMPORTANT FOR STUDIES

[GrandMasterFreshMpls]

I seriously have been watching videos of meiosis all night and not getting it, to the point where until I saw this video I was going to email my TA about being so confused. Now I get it. Thank you!

[studywithvidz]

E-X-C-E-L-L-E-N-T explanation :)

[cooperman1878]

Very well explained!

[azadalo]

Best video on Meiosis, helped me learn about variation



[superjollypower]

zoology exam on monday...thankss mrs meiosis

[Yakultyummy555]

OMG! Thanks!

Very helpful for my exam tomorrow.

[TheBellandross]

Thank you Mrs. Sullivan. i don't know who you are, but thanks.

[TheCholgas]

Thanks!

[rojeet3]

Thanks! Very helpful

[pilimontesinos]

are you sure that is 4n ? I'think is 4c!!

[Minidrags]

So much more competently explained than from the OCR A2 biology textbook. That book is filled with so much shite!

[dy17tennis]

uber great!

[JuKeShotClan]

thank you mrs sullivan!

[naruhina15full]

AWESOME!

[azz3M]

my 8 hours of studying summerized in 4 min.. why did I see this before?

[RandomCrewOfficial]

I want those beads! >_<

[nictz1]

This video is great... But what happen to the spindelfibers?

[Bfurness1]

@nictz1 almost think of her hands as the spindle fibers, they are what move the chromosomes around ie. lining them up down the middle etc. hope this helps and most of all hope i answered your question.

[raymondy36]

Be careful with what you call n-number, it's common to call the amount of copies C(=complements, quantity) and the number of ploidy n(=the number of sets of chromosoms)

so at prophase 1 you have 4C,2n

after mitosis 1: 2C, 1n

and after mitosis 2: 1C,1n

I know there are different notions in books

[idleperson]

aren't the spindle fibers in meiosis II perpendicular to the ones in meiosis I?

[uTubeveiwer2010]

Can someone answer me this please... How often does genetic recombination occur and does it only just occur in meiosis?

[asmith5150]

Really helpful! Thanks

[theMagicSquares]

Great video, it really helped

[Dawn777]

Thanks! this vid made things a bit easier.. i always get confused with meiosis T^T

[Nurr0]

Brilliant video. Very easy to understand.

[runner197]

Thanks! This really helped!

[prisaben]

wat does 'n' represent...? wat do u mean by DIFFERENT chromosomes...? why did she pair up all three(short , medium, long) chromosomes  together at the end...? Can Anyone help me out for these questions...? please...

[katmi623]

this was really good explanation!

[gomulkaa]

This was fantastic!

[killsourenemy]

So in this video it says that cells are 2n at the end of telophase 1. I've compared this info with what my teacher taught us and what other websites listed and cells become haploid at the end of telophase 1. They're no longer diploid. Also I'm pretty sure they never become quadploid 4n, so that's pretty misleading.

[wkwok]

@killsourenemy A normal cell is 2n. "n" represents the number of DIFFERENT chromosomes you have, and this is multiplied by 2 (one from mother, another from father). During interphase replication occurs so that the cell essentially becomes "4n". At the end of telophase I the cells have divided, and therefore the two daughter cells are both 2n. After the event of a second division (telophase II), the end product is four daughter cells, each with "n".

[CharlieWatchs]

Thanks this has made things much clearer! (you uploaded this on my 13th birthday)

[nitinmgcn]

thank u.. very useful

[kasimusmani]

Thank you. THANK YOU! Years of pain trying to understand it has just been cured in the space of 2 minutes xD THANK YOU!!!

[sayyidina27]

Oh my i was so lost until this video thank you SO MUCH!

[DeBoss316]

alright my bio teacher nevr taught me this so thanks so much u probably just helped me pass my test tomorrow :D

[himrawkz]

if only my book actually explained that the diploid cell under goes mitosis (sort) of, and those 2 cells then split to form the 4 haploids. It literally just defines it as A form of nuclear division in which the four daughter nuclei contain half the chromosome number of the parent nucleus, and doesnt elaborate much on that.

thanks for putting my mind at ease

[roughlysixfeettall]

I GET IT KNOW. THANK YOU SO MUCH!

[Kalinnha]

I finally got it!

Thanks a lot :D!

[89057mike]

our teachers should just make vids and let us use youtube during class

[clairthedork]

Thank you so much!

[purple492]

thank you soooo much

[SarahEllenOrWhat]

I have my exam tomorrow and this helped a lot, thanks!

[shortyxshort]

thank you!!!

[TheToeBrand]

At the beginning I was like.. wtf..? At the end I think I'm starting to get it now. Thanks! :)

[youngfranchizeballer]

thank you. i get it now

[Gothcupcake947]

Thank you! This really helped :)

[MimeInManBody]

GREAT! thanks a lot  :3

[becca2398]

You're so awesome!

[esrak0zer]

amazing!

[n0rion7]

cleared everything up THANKS! :)

[Merrick4393]

u just helped me passed bio.

[Mystro1989]

i wish my bio teacher did it this way. tyvm

[dounzzz]

Very Clear, great.a very easy to follow explanation. Thanks

[ishtargurl]

Perfect! I remember doing this in my freshman year lab and it was the only way I really understood. Best possible way to study meiosis!

[maryammagic1]

omg thaaank you so much! This is so clear and so helpful! One question, so in a normal cell, there are 2n , in a cell going through meiosis, there are 4n, and at the end, since the cell divides into 4, there ends up being n? is that right? thaank you once again (:

[m00035]

this is really helpful

[ancillar]

that was really clear! thank you

[Deadlytrick]

i was going insane until i watched this vid. Thanks!

[animerockz10]

ok that made sense !

[xinyinggoh0401]

Thanks alot. I get a better idea of what happen in Meiosis :)

[amelilafee]

wow now i finally got it ... thanks :)

[pissybits]

thanks maureen that was really helpful :)

[theeeLword]

ewww @ bradicalable bt good explanation

[The24275]

thx a lot it also make me all feeling this is a perfect explanation .

[ERICUNO1]

woow thank you so much 4 this video! now ill get a 7 on my test!

[EP1CF41LUR3x]

That's an interesting and fun way to look at Meiosis :D Thanks!

[juampacinco]

muy bueno!!

[Freeegoo]

i actually watched this 6 or 7 times, thank you for helping me pass biology

[MegaNinjaNick]

This explanation is golden, I really struggled with this subject and as far as knowing what happens I couldn't understand it "things like why 4n?" killed me inside. You've made me a happy man :_ )

[DevonCousin]

Perfect Explination!!!

[courtneelynn]

Awesome video! Clear step by step explanation helped sooo much! Thank you!

[a2012able]

THANKS

[AwesomeNessie]

This helped so much. Thank you.

[Birkirrey]

Excellent video, very informative!

[SweetPresea1]

I question myself why teachers don't explain in such a simple way.

Thanks for the explanation

[DevonCousin]

@SweetPresea1 I rekon i wish my biology teacher explained it this well.

[randomfightfan]

deffinately the best explaination I have heard yet. Could never get my mind wrapped around the cromos duplicating in S-phase to make 4n. Oh lookie there, I finally get it now!

[shanooouuuxxx]

very well explained!

[beetle5999]

we just studied that in class :|

[906250181]

thanks for that straight forward explanation.

[ponggolese]

Thanks a lot! You did what no other lecturer, video, book or tutorial did - make meiosis simple enough for my underpowered brain to process. Finally!

[Johnny9Storm]

Thanks a bunch, was worried about my IGCSE exams but you are a life saver.

[JoJeromeMP]

Thank you! In all the detail of each phase I was getting a bit stuck in the "big picture" overview. Most awesome and helpful demonstration!

[ninja0406]

you succeed at what so many teachers fail at... explaining clearly and completely the first time

[keonzee]

thank you soo much. This helped me understand meiosis for my test tomorrow :D

[proplan88131]

great video thanks

[mde03]

this is really helpful!!!

[Troklo]

Great explication thank you!

[cholodeatempan2]

excelent

ya le entendi

thanks

[dontexsistlivelife]

Fantastic, simple to understand and actually makes sense.

THANK YOU :)

[athmaja96]

thnx 4 d gr8 explanation

[Maguidoo]

thanks a lot!

[DarkfairyCT]

Great Video! Thank you for sharing!!!

[jamin001247]

Yaaay.... biology exam on wednesday....

[Gothcupcake947]

@jamin001247 OMG I have one wednesday too! Bad times :) Good luck! :D

[jamin001247]

@Gothcupcake947 Thanks. Got a B for the A-level in the end (god knows what i got in that exam). On my gap year now though :P.

Good luck! and to everyone else taking exams this year

[ajblair3]

Great video, but I believe there is a mistake:

After Telophase I (2:48), the two daughter cells have a haploid (n), not diploid (2n), number of chromosomes. While there are two chromatids per heterozygous chromosome, the ploidy is one as the chromosomes are duplicates from one parent. Is this correct?

[evilelton]

@ajblair3 Yes.

[anbessssa]

Excellent!!!!! Now I got it!!!!! thanks

[quietxthought]

I think this video just explained in 4 and a half minutes what it took my biology teacher weeks to teach us. I now have a much better understanding of it than she ever gave me.  Thank you so much, you are a lifesaver for my exam in a couple of weeks =]

[lankygit101]

Excellent explanation. Clear, concise, detailed and the magnetic beads worked well as a visual aid.

[TiZzZMeEe]

Absolutely Fantastic!

[5cocoa101]

thanks so much. this is just like what we did in our science class so it made much more sense than the other videos. now i wont fail my exam!

[MrMissme90]

SO NICE!!!! :)

[MyCommittee]

Thank you for a great video.

[RYANMOW]

nice video thanks

[sophieroseplatts]

im confused, it one bead string one chromatid or one chromosome?

[MyCommittee]

@sophieroseplatts

One bead string symbolises one chromosome, and thus 2 chromatides

[TheMusiclover1208]

@MyCommittee I'm not sure if that's true or not...

[TheMusiclover1208]

@MyCommittee

one string of beads represents a chromatid, 2 chromatid (2 strings of beads) represent a replicated chromosome. 2 chromatid= 1 replicated chromosome.

[TheMusiclover1208]

@MyCommittee

one string of beads represents a chromatid, 2 chromatid (2 strings of beads) represent a replicated chromosome. 2 chromatid= 1 replicated chromosome.

[quietxthought]

@sophieroseplatts hey this is really confusing but i think im right. When there is only 1 string of beads, before the DNA has duplicated, it is called a chromosome. However, when it doubles up (S phase), the whole thing is called a chromosome and the 2 identical strands are individually referred to as chromatids. When the chromosomes then split during anaphase 2, each individual strand is then referred to as a chromosome again.

I think this is right and im sorry if its not. hope this helped

[sophieroseplatts]

@quietxthought ahhhh yess i get it why cant they just have one silly name! ahaa well thanks very much anyway :) xxx

[MattySundevils1]

beauty =]

[plafin]

So after Meiosis I, the two new cells are still haploid, correct?

[0025439]

Perfectly clear explanation of meiosis, excellent demonstration

[MsMelrose7]

This is the best explanation I have seen thus far! I love it! It is straight to the point and just made me understand it a lot more. Now my test in a few days wont be as hard in biology 149 woooo!

[beluckyif6]

You just made A&P a little more tangible... thanks

[kristine12170]

best explanation :)

[Patrickthedutch]

try to explain this with evolution ..

[andreaecarter]

2N does not mean copies. 2n refers to two sets of chromosomes, in other words, PAIRS of chromosomes. In this case 2N =6 at the beginning of Meiosis 1 and then at the end, 1N = 3

[Go2Cherry]

This is the BEST!!!!! Thank you thank you thank you!! Can you make thousands of videos? You are awesome!!

[wove212]

great explanation! helped a lot.

[kjrnms2]

great!

[driftdriftdrift]

@bradicalable lol tmi

[nerveLapse]

@bradicalable I lol'ed. Thanks for sharing. XD

[Tyrt8]

Very helpful, uses simple but critical vocab. Thanks for the study aid! 5/5

[b1sheaba]

Great use of vocab thanks!

[peetswee]

OMG THANKYOU

[xredkax]

Thank you! It helped me alot!! :-) Great Vid

[doogiedog1234]

WEll done babe, this helped me alot.. better than the 3d computer models

[gavs3112]

very helpful. we did this in my bio lab but i didn't really understand it, you did a great job in fulling explaining all the steps.

[manchesterrulesda]

very easy to understand.. thankyou very much

[EOSchan]

i totally missed the little one it feels sad...thx for getting it credit

[machimbre2]

this is 2n =6 ????? puta meiosiss

[jamin001247]

i frickin love you!!

Sooooo much better that all the other vidoes, my text book and my teacher :P

I need to get meself some magnets!

[freezinghotter]

Better than the animations and my biology teacher at 9th grade used up twenty minutes explaining meiosis I

[Henry76]

fantastic. very easy. Tahanks

[y45ir18]

very easy to understand!! thankss

[sassymexicana]

OMG I FIALLY GOT DA WHOLE POINT OF MEOSIS....THIS IS LIKE MY PRAYERS JUST GOT ANSWERED =] thank you

[Arden15yr]

Omg thanks!! That was so clear and now I totally understand Thanks!!!♥

[skykey0]

omg this is why i love internet, and youtube... best school...some mean teachers...horrible explanations. This video is goin to save my future! thank u so much!!

[xline808]

Great video, thank you!

[sambheetkrishna1]

This was the best demonstration of Meiosis I have ever seen ! It was better than OCW's of top universities !

[kristijanog]

Thank you very much! Some use from youtube, finaly! Cheers from Croatia!

[hsain1]

the conclude my search of clarification on what exactly goes on in meiosis! thank you so much

[Rorona550]

Thank you! My son and I just wasted half an hour trying to make sense of the INCOMPLETE process as described in his school textbook. Thanks again for such a beautifully clear explanation.

[Sakartvelo69]

this is why I love youtube!! someone unlucky enough to have the worst teachers on the planet in school can still access the good stuff online. Thanks a million for the video...

[DivineSnapLife]

Oh My Gosh u saved my life

[Rogueixpresents]

very helpful

[xXxLittlexXxLisaxXx]

thankyou

this is soo helpful

really helped

:D

[FENUO0]

Thank you very much for the vid it helped with my exam revision

[9looksee1]

Clear, no-nonsense visual and explanation. This did the trick.

[Pietentrekker]

Gotta love the internet.

[DISCARBURAT0R]

finally .

no music no jumping or dancing stuff.

perfect explanation.

[MakitaAngLi16]

thank you soooooooooooo much!! i understood it but this was so helpful!!

[xMiro7x]

we can have sex and u teach me?

[nico201000]

En español por favor!!!

Very clear explanation. Thanks