PALs 3.5 Mitosis and Cancer

3.5

What is the cell cycle? What are the phases of the cell cycle, and their relative relationship time-wise?

cell cycle - “life cycle” of a cell phases

1. Interphase

2. Mitotic (M) Phases

relative relationship

• M phase → cytokinesis

What are the stages of cancer? How does cancer spread?

stage 0 - abnormal cells

stage 1 - cancer cells are in one specific part of the body

stage 2 - cancer advances in the one specific spot

stage 3 - continues to advance “late”

stage 4 - spread through multiple organs

spreads by metastasis

What happens in mitosis? What are the phases of mitosis? Can you identify and label phases on a diagram?

mitosis - somatic cells

1. prophase

2. metaphase

3. anaphase

4. telophase

What is the relationship between DNA, chromatin, and chromosomes?

DNA - double helix that carries genetic info

chromatin - DNA + protein

chromosomes - highly packed chromatin (sisters)

Why do cells divide?

1. reproduction of single celled organisms

2. multicell organisms grow

3. repair/replacement of cells

4. sperm/egg production