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Genetics help :'(

I know that naked DNA, for example in prokaryotic cells (bacteria), are not associated with the protein histone, and found free floating in the cytoplasm (in the nucleoid region?) But why use the work "naked" DNA?

Also... I need clarification on some terms: Chromosome and chromatid

I've got this diagram of a cross. What does that represent? I need help with genetics related topics :frown: Can someone please help!
Hope the explanation earlier helped

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