Question

1. match each mitosis stage to its key event. write your answer in the space provided

stage key event
a. prophase chromosomes line up at the cells equator
b. metaphase chromosomes condense and spindle fibers form
c. anaphase two new nuclei form and the spindle breaks down
d. telophase sister chromatids separate and move to opposite poles

Explanation:

• Prophase: Chromosomes condense and spindle fibers form. This is the first stage of mitosis where chromatin (loose DNA) condenses into visible chromosomes, and the mitotic spindle (composed of spindle fibers) begins to form.
• Metaphase: Chromosomes line up at the cell's equator. The chromosomes, attached to spindle fibers, align at the metaphase plate (the cell's equator), which ensures proper distribution of chromosomes during cell division.
• Anaphase: Sister chromatids separate and move to opposite poles. The sister chromatids (duplicated copies of a chromosome) are pulled apart by the spindle fibers and move towards the opposite ends (poles) of the cell.
• Telophase: Two new nuclei form and the spindle breaks down. New nuclear envelopes form around the separated sets of chromosomes at each pole, and the spindle apparatus disassembles.

Answer:

A. Chromosomes condense and spindle fibers form
B. Chromosomes line up at the cell's equator
C. Sister chromatids separate and move to opposite poles
D. Two new nuclei form and the spindle breaks down