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Chromosome behaviour and Variability

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vox nihili:

--- Quote from: sidzeman on August 13, 2017, 04:22:55 pm ---Yea thats a major source of my confusion - whats the difference between the 2
I know one of them is that when chromosomes split from the tetrad and line up to go into separate cells (this happens at metaphase 1 and 2 right?)  they do so randomly - so both paternal chromosomes wont be in one half and maternal in the other - it can be random
Is this random segregation? I'm not sure I understand independent assortment then

--- End quote ---

Good on you for having a crack at answering your own question first, we love to see that and you get a lot more out of it :)

They not really two different things. They describe different parts of the same concept.

Random segregation means that where the chromosomes end up is completely random. Whether they end up in cell A or B is simply by luck, nothing else.
Independent assortment on the other hand means that each chromosome does its own thing. In other words, the direction that chromosome 1 goes does not affect the direction that chromosome 2 goes etc etc.

sidzeman:
Sorry guys I still seem to be struggling. So do both principles occur at the same phase of meiosis - during anaphase 1 and 2?

pikachu975:

--- Quote from: sidzeman on August 13, 2017, 05:27:29 pm ---Sorry guys I still seem to be struggling. So do both principles occur at the same phase of meiosis - during anaphase 1 and 2?

--- End quote ---

Yep. Independent assortment isn't really a process it's just a rule that describes segregation (saying that genes assort independently).

sidzeman:
alright thank you guys so much for all your help

LetsBeCats:
If you still needed another one random selection of gametes is also another our teacher noted as there are heaps of egg and sperm but only certain ones meet :)

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