GCSE Biology - Cell cycles, Chromosomes & Mitosis #69

In order to survive and grow, organisms require a constant supply of new cells. In this video we explore how these cells are generated through the cell cycle, with a particular focus on mitosis. We will also look at the role chromosomes play and the different forms they take.

In this video, we'll look at:
- How new cells are generated by the cell cycle
- What mitosis is, and how it works
- The role of chromosomes, and the different forms they take

[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:
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Amadeus & Tom

[TPhype-Discovery]

I watched this one day before my biology science test, and I got a Grade 8. That's the highest I've ever gotten in a science test. Thank you so much Cognito!

[ayeshasu]

Hi, I just wanna say a huge thank you to the creators of this channel, I use your website on a daily basis! These videos are honestly carrying my GCSEs!

[miasando]

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

[emaanfaruki]

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)

[sheilaagyei-afari]

Please you need to make a level versions of this as well. Because this is so so helpful!

[ashirmalik]

gcse's in 3 days and this is the best ive learnt all year ur channel is a big help

[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 :)

[marvinsingh]

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

[mehtab.mp]

what did the cell say to the other cell that stepped on its toes?
mi to sis
hahah anyways these videos are great i love them

[nancyhubbert]

i have my paper 1 tomorrow! thank you!!

[ramandeepnijjar]

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[zawiyaimran]

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

[emaanfaruki]

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 !

[juliahaworth]

Do you cover all biology topics for triple science?

[finntitmus]

So helpful. Finally understand Mitosis, thank you 🙏

[halalbangali]

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

[batiannolte]

Gosh these videos are way to well made and easy to understand... honestly unfair for other students

[sulaewadi]

I was struggling with inheritance but you've helped a lot. Thank you, sir!

[Countdown]

Episode 69 should have been about meiosis and fertilisation😮‍💨