Question

mitosis
how do living things grow and repair themselves?
why?
living things must grow and develop. at times they suffer injuries or damage, or cells simply wear out.
new cells must be formed for the organism to survive. what process must occur to make a new, properly-
functioning cell?
model 1 – mitosis as part of the cell cycle

1. refer to model 1. list the four phases in the mitosis process.
2. where is mitosis in the cell cycle? before ____________ and after _____________.
3. what three phases of the cell cycle are considered interphase?
4. refer to the cell cycle shown.

a. how many cells are present at the beginning of mitosis?
b. how many cells are present at the end of mitosis?

Explanation:

1. The four distinct stages of mitosis are labeled explicitly in Model 1.
2. In the cell cycle, mitosis (nuclear division) is followed by cytoplasmic division (cytokinesis), and comes after interphase (the growth/DNA replication phase).
3. Interphase consists of three sequential phases focused on cell growth and DNA preparation for division.
4. a. Mitosis starts with a single parent cell that has replicated its DNA.
5. b. Mitosis and subsequent cytokinesis produce two genetically identical daughter cells.

Answer:

1. Prophase, Metaphase, Anaphase, Telophase
2. Before cytokinesis and after interphase
3. G₁ (Gap 1), S (Synthesis), G₂ (Gap 2)
4. a. 1

b. 2