Cell division is literally happening inside your body right now... Show more
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Updated Mar 15, 2026
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GCSE AQA Triple Science Higher B2 Simplified Notes
Heidi
@_heidi.1989.
Cell Division and Mitosis
Your body is constantly making new cells through a process called mitosis. Think of it like photocopying - when a cell divides, it creates two identical copies of itself, each with exactly the same genetic information.
Here's how it works: imagine a normal cell with 4 chromosomes arranged in 2 pairs. Before the cell divides, it makes a complete copy of each chromosome. Then the cell splits into two daughter cells, each containing the same 4 chromosomes as the original parent cell.
The cell cycle happens in three main stages. First, the DNA gets replicated and new cell parts are made. Then mitosis occurs where the nucleus divides. Finally, the whole cell splits in two.
Why it matters: Mitosis is essential for growth, healing injuries, and developing from a baby into an adult. Without it, you'd never grow taller or heal that paper cut!
Differentiation is when cells become specialised for specific jobs. In animals like humans, this happens very early in life. However, plant cells are more flexible - they can differentiate throughout their entire lives, especially in areas called meristems found in roots and shoots.
Stem Cells and Medical Applications
Stem cells are like the ultimate shape-shifters of biology. These undifferentiated cells haven't chosen their career yet - they can become any type of specialised cell your body needs, from brain cells to muscle cells.
There are two main types you need to know about. Embryonic stem cells come from human embryos and can become absolutely any cell type. Adult stem cells are found in places like bone marrow and are slightly more limited but still incredibly useful.
Scientists can clone stem cells and turn them into different cell types for medical treatments. Plant stem cells from meristems are already being used to quickly produce identical plant clones for farming and research.
Medical breakthrough: Stem cell treatments show promise for conditions like diabetes, potentially offering cures rather than just managing symptoms.
However, stem cell research faces several challenges. There are religious and moral concerns about using embryonic stem cells. The treatments are expensive, slow, and difficult to control. Adult stem cells carry risks of viral infections, and there's always the chance your body might reject them. Despite these hurdles, stem cell research continues to advance rapidly.
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very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
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THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
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This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
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The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user
GCSE AQA Triple Science Higher B2 Simplified Notes
Heidi
@_heidi.1989.
Cell division is literally happening inside your body right now as you read this! Every second, millions of your cells are dividing to help you grow, heal cuts, and replace old cells. Understanding how this process works will help you... Show more
Cell Division and Mitosis
Your body is constantly making new cells through a process called mitosis. Think of it like photocopying - when a cell divides, it creates two identical copies of itself, each with exactly the same genetic information.
Here's how it works: imagine a normal cell with 4 chromosomes arranged in 2 pairs. Before the cell divides, it makes a complete copy of each chromosome. Then the cell splits into two daughter cells, each containing the same 4 chromosomes as the original parent cell.
The cell cycle happens in three main stages. First, the DNA gets replicated and new cell parts are made. Then mitosis occurs where the nucleus divides. Finally, the whole cell splits in two.
Why it matters: Mitosis is essential for growth, healing injuries, and developing from a baby into an adult. Without it, you'd never grow taller or heal that paper cut!
Differentiation is when cells become specialised for specific jobs. In animals like humans, this happens very early in life. However, plant cells are more flexible - they can differentiate throughout their entire lives, especially in areas called meristems found in roots and shoots.
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Stem Cells and Medical Applications
Stem cells are like the ultimate shape-shifters of biology. These undifferentiated cells haven't chosen their career yet - they can become any type of specialised cell your body needs, from brain cells to muscle cells.
There are two main types you need to know about. Embryonic stem cells come from human embryos and can become absolutely any cell type. Adult stem cells are found in places like bone marrow and are slightly more limited but still incredibly useful.
Scientists can clone stem cells and turn them into different cell types for medical treatments. Plant stem cells from meristems are already being used to quickly produce identical plant clones for farming and research.
Medical breakthrough: Stem cell treatments show promise for conditions like diabetes, potentially offering cures rather than just managing symptoms.
However, stem cell research faces several challenges. There are religious and moral concerns about using embryonic stem cells. The treatments are expensive, slow, and difficult to control. Adult stem cells carry risks of viral infections, and there's always the chance your body might reject them. Despite these hurdles, stem cell research continues to advance rapidly.
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The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
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In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
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very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
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Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user