Non-sister chromatid

Can someone tell me the meaning of some biology's terms? The terms are as follow: Chromosome Homologous Chromosome Chromatin Chromatid Bivalent Tetrad But not least tell me the differentiate between them. I hope you can label all of them in picture so that I can understand well. Thanks ...

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... (46 Chromosomes). Before it enters meiosis, its chromosomes have been duplicates (DNA synthesis), which means that the chromosomes each have 2 chromatids joined together in an "X" shape. After meiosis 1, the homologous chromosomes separate, so that each of the 2 daughter cells have ...

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In metaphase I can both of the chromatids of a double chromosome crossover? In textbooks the tetrad complex is always shown laid flat (it looks like XX ) so it makes since that only one chromatid from each double chromosome would be able ...

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except chromatine is spelled chromatin 8)

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http://answers.yahoo.com/question/index?qid=20071021101011AAEl5SU and this may help http://en.wikipedia.org/wiki/Histone

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