During prophase, the complex of DNA and proteins contained in the nucleus, known as chromatin, condenses. The chromatin coils and becomes increasingly compact, resulting in the formation of visible chromosomes. ... The sister chromatids are pairs of identical copies of DNA joined at a point called the centromere.

What happens in prophase simple?

prophase. [ prō′fāz′ ] The first stage of mitosis, during which the chromosomes condense and become visible, the nuclear membrane breaks down, and the spindle apparatus forms at opposite poles of the cell.

What happens during prophase quizlet?

What happens during prophase? A cells genetic DNA condenses, spindle fibers begin to form and the nuclear envelope dissolves. ... The duplicated chromosomes line up and spindle fibers connect to the centromeres. You just studied 9 terms!