Question

1. what are the 3 main stages of the cell cycle?
2. explain what happens in interphase. what are the 3 phases of interphase?
3. which stage of the cell cycle lasts the longest? why?
4. label the chromosome below with the following terms: sister chromatids, centromere

chromosome structure
\unduplicated\ \duplicated\

1. what is the purpose of the spindle?
2. at the end of cytokinesis, what are the 2 cells called?
3. are the results of mitosis and cytokinesis identical to each other? to the original cell?

Explanation:

1. The three main stages of the cell cycle are interphase, mitosis, and cytokinesis. Interphase is the growth - and preparation phase, mitosis is the nuclear division phase, and cytokinesis is the cytoplasmic division phase.
2. In interphase, the cell grows, replicates its DNA, and prepares for cell division. The three phases of interphase are G1 (first gap - cell growth and normal functions), S (synthesis - DNA replication), and G2 (second gap - further growth and preparation for mitosis).
3. Interphase typically lasts the longest because the cell needs time to grow, replicate DNA accurately, and synthesize necessary proteins and organelles for cell division.
4. On the "duplicated" chromosome, the two identical parts are sister chromatids, and the constricted region holding them together is the centromere.
5. The spindle's purpose is to separate sister chromatids during mitosis and move them to opposite poles of the cell, ensuring equal distribution of genetic material.
6. At the end of cytokinesis, the two cells are called daughter cells.
7. The results of mitosis and cytokinesis are identical to the original cell in terms of genetic content. Mitosis ensures the accurate distribution of replicated chromosomes, and cytokinesis divides the cytoplasm to form two genetically - identical daughter cells.

Answer:

1. Interphase, Mitosis, Cytokinesis
2. In interphase, the cell grows, replicates DNA and prepares for division. The phases are G1, S, G2.
3. Interphase. It needs time for growth, DNA replication and preparation.
4. On the "duplicated" chromosome: the two parts are sister chromatids, the constricted region is centromere.
5. To separate sister chromatids and move them to opposite poles.
6. Daughter cells
7. Yes, they are identical to the original cell in genetic content.