Question

summarize what happens during mitests. then, identify the four stages of mitosis.

Explanation:

Summary of Mitosis:

Mitosis is a type of cell division in eukaryotic cells that results in two daughter cells, each having the same number and kind of chromosomes as the parent nucleus. It is essential for growth, repair, and asexual reproduction. During mitosis, the nucleus of the cell divides, and then the cytoplasm divides (cytokinesis) to form two new cells. The genetic material (chromosomes) is duplicated during interphase (before mitosis) and then separated equally into the two daughter cells during mitosis.

Four Stages of Mitosis:

1. Prophase:

• Chromatin condenses into visible chromosomes, each consisting of two sister chromatids joined at the centromere.
• The nuclear envelope breaks down.
• The mitotic spindle (composed of microtubules) begins to form from the centrosomes, which move to opposite poles of the cell.

1. Metaphase:

• The chromosomes align at the metaphase plate (the equatorial plane of the cell).
• The spindle fibers attach to the centromeres of each chromosome, ensuring that each sister chromatid will be pulled to opposite poles.

1. Anaphase:

• The sister chromatids are separated at the centromere.
• The spindle fibers shorten, pulling the now - individual chromosomes (formerly sister chromatids) to opposite poles of the cell. This ensures that each pole will receive a complete set of chromosomes.

1. Telophase:

• The chromosomes reach the opposite poles and begin to de - condense back into chromatin.
• A new nuclear envelope forms around each set of chromosomes, creating two new nuclei.
• The mitotic spindle breaks down. After telophase, cytokinesis usually occurs, dividing the cytoplasm and organelles between the two daughter cells, resulting in two genetically identical daughter cells.

Answer:

Summary of Mitosis:

Mitosis is eukaryotic cell division producing two daughter cells with the same chromosome number as the parent. It involves nuclear division (and subsequent cytokinesis) to distribute duplicated genetic material equally.

Four Stages of Mitosis:

1. Prophase: Chromosomes condense, nuclear envelope breaks, spindle forms.
2. Metaphase: Chromosomes align at metaphase plate, spindle attaches to centromeres.
3. Anaphase: Sister chromatids separate, pulled to opposite poles.
4. Telophase: Chromosomes de - condense, new nuclear envelopes form, spindle breaks down.