effect of non-disjunction at various phases of the meiosis/cycle. Someone please explain

[mrh125]

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how can you tell whether a non-disjunction occurs during meiosis 1 or meiosis 2 (prophase or anaphase) based of what genetic combination (like XXXY) is produced and what are the effects of each on the cells produced (like usually in some examples it leads to the production of organisms with kleifinger syndrome)? I never really understood this in genetics or the logic behind it.

 

[Teleologist]

Well, think about the various phases of meiosis, and what each step entails.

 

[JoeKing]

http://genetics.thetech.org/sites/default/files/NonDisjunction12.gif