N-6 Cell Division

What do cells spend their time doing? Why do they do this?

Cell Cycle: The regular sequence of growth and division that happens in cells

Stage 1: Interphase

During interphase, the cell grows to its mature size, makes a copy of its DNA, and prepares to divide into two cells Growth – during the first part of interphase, the

cell doubles in size DNA Replication – the cell makes a copy of its

DNA in the nucleus. This means that there are TWO copies of the DNA (instructions) in each nucleus

Cells spend 90% of their lives in this stage

Stage 2: Mitosis

During mitosis, one copy of the DNA is distributed into each of the two ‘daughter’ cells.

This is divided into four parts: Prophase Metaphase Anaphase Telophase

Chromosomes:(humans have 23 pairs)

DNA

Centromere

Two Chromatids

Mitosis - Prophase

Chromosomes are visible

Mitosis - Metaphase

Chromosomes line up in center of the cell

Mitosis - Anaphase

Chromatids are pulled to opposite ends of the cell

Mitosis - Telophase

New nuclear membranes form around each new set of chromosomes

Stage 3: Cytokinesis

The cell membrane ‘pinches’ together in the middle of the cell forming two ‘daughter’ cells.

Cytoplasm divides, distributing the organelles into each of the new cells.

Can we identify the following?

1. Prophase2. Metaphase3. Cytokinesis4. Telophase5. Telophase6. Metaphase7. Prophase8. Anaphase9. Ana or Telo?10. Interphase

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DNA Replication

DNA Replication ensures that each daughter cell will have all of the genetic information it needs to carry out its activities.

There are four pieces of the puzzle: Adenine and Thymine Cytosine and Guanine

The order that these ‘pieces’ fit together determine our genetics! Animation