Which of the following choices lists mitosis phases in the appropriate sequence? A. prophase, metaphase, anaphase, telophase B. anaphase, prophase, metaphase, telophase C. interphase, prophase, metaphase, telophase D. prophase, metaphase, anaphase, telophase, G1 phase
To determine the correct sequence of mitosis phases, it is important to understand the process of mitosis. Mitosis is the division of a cell's nucleus into two identical daughter nuclei, each with the same number of chromosomes as the parent cell. It consists of several distinct phases:
1. Prophase: This is the initial phase of mitosis. The chromatin condenses and becomes visible as chromosomes. The nuclear envelope breaks down, and the spindle fibers start to form.
2. Metaphase: During metaphase, the chromosomes line up along the equatorial plate of the cell. This alignment ensures that each daughter cell receives an equal number of chromosomes.
3. Anaphase: In anaphase, the sister chromatids separate and are pulled apart by the spindle fibers towards opposite poles of the cell.
4. Telophase: Telophase marks the final phase of mitosis. The chromosomes reach the opposite poles of the cell, and nuclear envelopes begin to reform around each set of chromosomes. The spindle fibers disassemble, and the chromosomes start to unwind, becoming less condensed.
5. Cytokinesis: Although not explicitly mentioned in the given choices, cytokinesis occurs after mitosis. It involves the physical separation of the cytoplasm, organelles, and cellular components, resulting in two distinct daughter cells.
Now, let's analyze the given choices:
A. Prophase, metaphase, anaphase, telophase: This sequence is correct and follows the chronological order of mitotic phases. Therefore, Option A is the correct choice.
B. Anaphase, prophase, metaphase, telophase: This sequence is incorrect as it does not follow the correct order of mitotic phases.
C. Interphase, prophase, metaphase, telophase: This sequence is incorrect because it includes "interphase," which is not a phase of mitosis.
D. Prophase, metaphase, anaphase, telophase, G1 phase: This sequence is incorrect because it includes "G1 phase," which is a part of the cell cycle but not a phase of mitosis.
In conclusion, the correct choice that lists the mitosis phases in the appropriate sequence is Option A: prophase, metaphase, anaphase, telophase.