GCSE Biology - Cell cycles, Chromosomes & Mitosis #69

[@Cognitoedu]

If you’d like to practise the material covered in this video, check out our platform at www.cognitoedu.org - it's totally free, and has built specifically to make learning and revision as quick and easy as possible. The main features are: - Lessons organised by topic, only the lessons relevant to your specific exam board and tier are shown. - Automatic progress tracking. Progress bars tell you at a glance what you’re doing well at, and what you need to spend some time on. - Practise quizzes so you can test your knowledge. You can quiz yourself on any combination of topics you like. - A huge number of fully-hinted questions that take you step-by-step through some of the trickiest calculations & concepts. - A huge bank of past exam papers, organised both by year, and also by topic. Amadeus & Tom

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Hi, this is extremely helpful because I’ve got my GCSEs year 9 in just under a week and I have really enjoyed the parts on this with the drawings and notes so thank you so muchhhhh!

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Aw thank you so much Ayesha, hope the GCSEs go well 🙏

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How did they go

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I’m doing my final mocks at the minute ( I do triple science) and honestly you are so underrated ! Your videos are so helpful, especially the drawings and diagrams

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Fr

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Relate much 😅

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Fr

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[@emaanfaruki6846]

anyone who needs it here r the notes: Cell cycles,chromosomes and mitosis - All multicellular organisms (humans, animals) require a continuous supply of new cells - For growth (younger children) ,development and repair (skin cells which constantly fall off) - Process which these cells are generated cakes the cell cycle (life cycle of cell) - Growth, DNA replication + mitosis , division (cytokinesis) - Step one...cell grows in size and increases the number of sub secular structures it contains (mitochondria, ribosomes) - Step 2... DNA (chromosomes) is replicated so the 2 new cells will have a full set of DNA, but the duplicate stays attached to the other chromosomes that it was copied from (x shape) - Step 3... When ready to divide, all 46 chromosomes line up in cell centre and cell fibres from each side of cell attach to the half of the chromosome, and they pull the half of the chromosome to the opposite sides of the cell (opposite poles) breaking them into halves - Step 4... Division ... Cell membrane and cytoplasm pull apart forming 2 daughter cells ( each cells have the same DNA and are identical)

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It's so disappointing that a certified book is more complicated than just a simple video on KZbin

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[@Cloudey-puffo]

There's also another approach to memorise the phases of mitosis which is the P.M.A.T strategy (prophase, metaphase, anaphase, telophase.) including Cytokinesis which is just the separation/division into daughter cells also when alienation/division takes place a nucleus is formed as well :)

[@smartarham_55]

I think there is another step called interphase

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Hi Em, thanks so much for the comment - really happy you found it useful!

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How does this channel make something that takes like an hour to teach in class make sense in 15 minutes or less.

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i honestly dunno how theyre teaching me this in gr7 but its way easier here to understand. Thank you, Cognito!

[@ramandeepnijjar8281]

Thank you so much for all your videos. I am watching them all for Biology, Chemistry and Geography GSCE to make sure I know all the content. In preparation for A level. They are so helpful so thank you!

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You are the only channel that helps me understand science really well !! thanks :)

[@InsanePODclips]

So helpful. Finally understand Mitosis, thank you 🙏

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i have my gcse in 5 days but can only revise for like 3 hrs and i haven't revisised im on a grade 3 lets see what i get with this vid. the ultimate test !

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Do you cover all biology topics for triple science?

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Hi Julia, we have some left to release, but yes we’ll cover everything bar the practicals :)

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Mines in 8 and I just started all my revision today 😭

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Episode 69 should have been about meiosis and fertilisation😮‍💨

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Wait which bit is mitosis he didn’t clarify it?

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yes, it is :) if you go on their website, you can filter it exactly to your course, such as "higher or foundation, triple or combined and it also has options for whether you're doing AQA GCSE or Edexcel GCSE, etc" It has all the topics with videos and example practice questions. Highly recommend it :)

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Thankyou, it's great to have you as a subscriber!!

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Biology mock tmrw

[@bandukleiceste1922]

So you say humans have 23 pairs of chromosomes.. does that mean 23 pairs of chromosomes in every body cell?

[@Cognitoedu]

Hi Fly - almost. Sex cells like egg and sperm cells actually only have 23, and our red blood cells don't have any chromosomes.

[@arabella7371]

@Alishba Khan theres 23 pairs of chromosomes... what is 22 pairs is autosomes..

[@arabella7371]

@Alishba Khan theres 23 pairs of chromosomes... what is 22 pairs is autosomes..

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So then what is differentiation?

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Wait so what is the second stage called after interphase??

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I totally don`t have my biology mock on tuesday

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Commented

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Great Video Mate.

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GCSE's next week lol

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but why do they duplicate i’m confused

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You’re very welcome! Really great to hear they helped! 🥳

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Is this video 46 or 48 I'm quite confused since, the title says 4. Thanks!

[@somanytvshowshavecausedmee899]

It's the fourth video in the biology playlist, that's what it means

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Sounded like a CGP textbook lol

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Am in year 10 doing combined foundation exams in a week which could determine if I do higher ahhhh am stressed.

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The thing i find hard is putting all this information to answer a exam styled question

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[@hongjoongswife9672]

so each cell in our bodies has 46 chromosomes?

[@Cognitoedu]

Heya - nearly all of them. Sex cells like egg and sperm cells only have 23, and red blood cells don't have any.

[@libbyclayton1649]

Cognito does this mean then that when the sperm and egg join that the 23 in the sperm and the other 23 in the egg join to become 46?

[@knockknockitsvenom4034]

@@libbyclayton1649 yes thats right haploid and haploid gamete fuses to form diploid zygote

[@libbyclayton1649]

knockknock itsvenom okay thank you

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YOU DUM THERE IS 23 EACH NOT $^ THAT IS IN TOTAL

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I did not enjoy this

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Why? If you find it hard, watch it a few times.

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Bad

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L

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In textbooks it is much more complicated and not obvious

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Thank you

[@Cognitoedu]

You’re super welcome! Thanks for the comment and support 🥂

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