The Cell Cycle and Mitosis: An Intro

SNC2D

The Cell Cycle

Every hour, approximately 1 billion of your cells die – but approximately 1 billion cells are created in a process of cell division called mitosis.

Interphase

The cell prepares for cell division by growing (producing new proteins and organelles) and by synthesizing copies of its DNA (the chromatin).

This stage of the cell cycle is called interphase.

Prophase

During the first phase of mitosis, prophase, the chromatin condenses into chromosomes and the nuclear structure disintegrates. A framework called the mitotic spindle forms.

Metaphase

Next the chromosomes line up in the middle of the cell. This is metaphase.

Anaphase

During anaphase, the chromosomes separate and are pulled to opposite ends of the cell.

Telophase and Cytokinesis

In the last stage of mitosis, telophase, the cell divides the cytoplasm into two portions. The final separation of the cytoplasm into two distinct cells is called cytokinesis.

Your Task

Your task will be to identify the structures that will allow you to identify each phase and then to observe mitosis in a prepared slide of an onion root tip.