Abnormal Meiosis | Non-disjunction and the formation of Down syndrome

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In this video we look at the mechanism at work when meiosis does not go to plan.
Here we look at what non-disjunction is, when is occurs as well as how to explain these complex ideas in an exam setting.
Table of contents:
Intro 00:00
What is non-disjunction 03:52
When does it occur 05:00
Results of non-disjunction 07:05
Down syndrome 09:55
Terminology recap 12:14

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Learning this stuff 12 hours before my test, let's get it😂

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Imagine

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Hi there yes you can print it once purchased

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[@ArghmanSyed]

Hi I have a question. I’m confused when you explained at 2:30 how the cell at the start has 8 chromosomes then your dived into to cells. Each cell will get 4 and then you divide again. Shouldn’t then each cell get 2. I don’t understand how it’s still 4.
Even in the diagram the there are 4 chromosomes in the first picture and 8 chromatids. Then in but the end each cell has 2 chromosomes