染色质核仁

例句：

1. 1. The study of genetics is crucial for understanding the structure and function of chromosomes.
   研究遗传学对于理解染色体的结构与功能至关重要。
2. 2. The cell's nucleus contains the genetic material, which is organized into chromosomes.
   细胞的核内含有遗传物质，这些物质被组织成染色体。
3. 3. Chromosomes are responsible for carrying the genes that determine an organism's traits and characteristics.
   染色体负责携带决定一个生物体特征和特性的基因。