染色体作为主要的遗传物质DNA载体，研究它的结构和功能是细胞遗传学必不可少的重要环节。

It is an important process of cytogenetics to study the structures and functions of chromosome, the main carrier of genetic material DNA.

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DNA是生物体主要的遗传物质，有关DNA的研究是揭示生物遗传奥秘的基础。

DNA is the main hereditary substance of biological object. The study on DNA is the basis of exposing biological heredity secrets.

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