Meiosis

[@caaaaaammy_g]

Life saver bro, other videos on meiosis arent clear but this one is straight to the point without waffling

[@harrybrown-king3720]

Mr pollock is like the a-level freesciencelessons

[@fatimaomer1132]

It's crazy how my teacher has spent 30-40 mins on this and you've only spent 8 mins. It's straight to the point! Thanks for the video :)

[@zidaansiddiq3117]

+Fatima Omer 8 mins 22 seconds

[@kainatirfan568]

Literally

[@hayleychesman9950]

Thank you so much, during this time of social distancing you're helping me and the rest of my biology class out a lot.

[@missamvmaker]

You're a life saver! You're posting everything i'm struggling with

[@MrPollockBiology]

Haha lucky you! Best of luck with the revision..I'm hoping to post maybe a couple more unit 2 videos before the exam so keep checking back!

[@reyna7100]

Mr Pollock actually helps me so so so much and really enjoy these videos! Thank you!

[@charlieward9987]

Quality channel, helped my revision so much!

[@MrPollockBiology]

Charlie Ward Thanks for the kind words! Glad I could help.

[@jackdixon2523]

When you watch KZbin revision videos to avoid watching cat videos and there's goddamn adorable bunnies in it!!

[@nickpayne2775]

Thanks so much! I've really struggled with this but this video has helped loads.

[@MrPollockBiology]

Nick Payne No worries!

[@MA-iv6yy]

is there a video about protein synthesis thanks

[@mistarizla]

have you got a video on Antibiotics and Bacterial Reproduction? Would be be very helpful

[@MrPollockBiology]

Njmstorm Afraid not, but yo should check out this exam Q video...kzbin.info/www/bejne/b2mzh6R3bNd1osk

[@jademerifield]

Thank you so much! You are a star!

[@MrPollockBiology]

jademerifield Cheers!

[@adriancorgiani994]

Thanks man, you just saved me lots of time

[@kainatirfan568]

Really helpful video thankyou!

[@izzysiddle4179]

Thank you !

[@ranicoleman7121]

Could you do a video on dna hybridisation? Would be extremely useful!

[@MrPollockBiology]

Rani Coleman Possibly if I get chance...new mitosis vid just gone up. DNA Hybridisation in a nutshell.... - Get DNA from two species - Radioactively label DNA from Species A -Heat both to separate strands -Mix strands from both species and cool - Hydrogen bonds form...more = stronger -Heat hybrid strand...the higher the temp before breaking..the more hydrogen bonds have formed, therefore the more complementary bases...therefore closely related. done :)

[@MCSH2309011]

Mr Pollock Don't you have to cool them as well?

[@bushra190]

Thank you so much! You are amazing please make more videos on new spec A level.

[@GingerBeard995]

Great help, you're a legend thanks!

[@bethanmcginley3518]

Hi, could you just double check to see if what I understand is right? Video was really helpful, thank you! Before Meiosis I, there's a paternal chromosome= I, and a maternal chromosome= I. These are a homologous pair and because they code for the same genes (although they may have different alleles). Before Meiosis I, both replicate themselves, so the maternal goes from an I to X shape so what was originally a single chromosome is now 1 of 2 chromatids that forms a chromosome (now X shaped because the single has replicated)...is this right? Is I shape a chromosome and when it replicates it becomes a chromatid? then the paternal and maternal homologous pair align XX and may swap DNA (genetic recombination) and then are randomly separated into daughter cells according the way they line up due to independent assortment?

[@MrPollockBiology]

Bethan Mcginley In this video I have not included the stage where the DNA replicates...this is explained in my mitosis vid. You are correct that the maternal and paternal chromosomes are homologous and your definition is correct. The chromosome (X shape) consists of two sister chromatids (I shapes) that have duplicated during mitosis. I hope that helps?

[@bethanmcginley3518]

Thank you so much! yes that's great! Your video's help so much! Thank you!:)

[@MrPollockBiology]

Not a problem. Glad you're enjoying!

[@M3HAN]

Great video, but ne thing that always baffles me is that how come at the end when you were explaining Independent Segregation with that image, there were more chromosomes that the one you previously used? Since now there's a diploid cell than haploid? Please explain

[@MrPollockBiology]

For the independent segregation explanation to work, you need more than one chromosome to use as an example. If you look carefully at the image, the original cell has 4 chromosomes (diploid) and the gametes end up with 2 chromosomes (haploid).

[@M3HAN]

Mr Pollock Ohhh right thanks for clearing it up! Always thought for a cell to be a diploid cell it needs to have 2 chromosomes

[@MrPollockBiology]

***** No probs

[@estheradeleke9639]

Why didn't you mention prophase, metaphase, anaphase, telophase and cytokinesis?

[@haza9988]

esther adeleke thats mitosis

[@MillieMinshall]

it also occurs when the cells split in meiosis

[@sineadryan4424]

What's the difference between independent assortment and independent segregation?

[@niomibell4214]

Sinead Ryan same thing

[@rayyanahusmani9184]

Hi, do we not need to learn each stage in detail (prophase,late prophase, metaphase, anaphase, telophase) . I'm a private candidate and a bit confused. Thanks

[@kairiannah]

+Rayyanah Usmani those stages only apply to mitosis, this video is solely meiosis :3

[@rayyanahusmani9184]

+Utopic thanks, i was just making sure as in ocr, I think you have to learn those stages for meiosis.

[@kairiannah]

Rayyanah Usmani oh fair enough, I guess the OCR spec will tell you what you need to know :)

[@rayyanahusmani9184]

+Utopic I'm doing aqa :) it's just something I though I'd clarify...that we don't need to learn meiosis in extra detail. Thanks though. 👍🏼

[@kairiannah]

Rayyanah Usmani OHH I thought you meant that you were doing OCR bio, but yeah anytime and good luck for the exam :)

[@emaanm3555]

3:33 *hey look... a nucleus* looolol

[@lauramoelker9135]

Does independent segregation happen only happen in Meiosis 2?

[@mz_desai2768]

Laura Moelker aluminum/aluminium, its the way people wanna pronounce it

[@ruqayyahamin6849]

omg thank you !!!

[@MrPollockBiology]

+Ruqayyah Amin No worries!

[@MA-iv6yy]

is there a video about protein synthesis thanks