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I'm sorry for the incredibly simple question, I just can't seem to find any answers elsewhere online.
I am a high school student currently studying for the upcoming AP biology exam, and recently I have realised that I do not quite understand chromosomes. To be specific, I understand what they are (the condensed form of chromatin that one sees when viewing a dividing cell), but my understanding is still lacking when it comes to:

  • Ploidy, specifically when it changes.
  • Alleles and how they move/interact during meiosis.
  • How homologous chromosomes work: When do they occur? Is each chromatid pair identical, or is one chromatid in each pair from each parent?

I made a diagram that details my current understanding, because it can be a bit difficult to describe what I don't understand, but I can try to elaborate more if necessary.
my current understanding of chromosome behaviour

If this is the wrong sort of place to ask this question, some advice on a better place to ask would be greatly appreciated.
Thanks.

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closed as too broad by David, theforestecologist Apr 29 at 18:06

Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.