Prophase

Definition

Prophase is the first stage of cell division in both mitosis and meiosis, during which the chromatin condenses into visible chromosomes, and the nuclear envelope begins to disintegrate. Spindle fibers also start to form in preparation for chromosome movement.

Related terms

Chromatin: The material that makes up chromosomes, consisting of DNA and proteins, that condenses during prophase.

Mitosis: A type of cell division that results in two daughter cells each having the same number and kind of chromosomes as the parent nucleus.

Spindle fibers: Protein structures that form early in cell division, playing a crucial role in separating chromosomes during mitosis and meiosis