Question

Match the stage of mitosis with the correct description.

a. Microtubles that are attached to each chromosome shorten, pulling the sister chromatids apart.

b. The chromosomes line up single file in the middle of the cell. Sister chromatids are clearly visible in this stage.

c. The chromosomes that were pulled apart reach their respective poles. The chromosomes decondense. The nuclear envelope re-forms. The cytoplasm with organelles divides.

d. Chromosomes have replicated and appear as an "X". The nuclear envelope begins to break down. The chromosomes begin to condense into individual structures.

e. Centrosomes move to the opposite ends of the cell and establish two spindle poles.The nuclear envelope is completely degraded by the end of this stage. The chromosomes are completely consensed by the end of this stage.

f. Not actually part of mitosis; this stage is the part of the cell cycle that is not the mitotic phase. DNA is decondensed and appears diffuse throughout the nucleus.

1. Interphase

2. Prophase

3. Prometaphase

4. Metaphase

5. Anaphase

6. Telophase and cytokinesis

Answer 1

1. Interphase - f. Not actually part of mitosis; the stage is the part of the cell cycle that is not the mitotic phase. DNA is decondensed and appears diffuse throughout the nucleus.

2. Prophase - d. Chromosomes have replicated and appear as '' X'' . The nuclear envelope begins to breakdown. The chromosomes begin to condense into individual structures.

3. Prometaphase - e. Centrosomes move to the opposite ends of the cell and establish two spindle poles. The nuclear envelope is completely degraded by the end of this stage. The chromosomes are completely condensed by the end of this stage.

4. Metaphase - b. The chromosomes line up single file in the middle of the cell. Sister chromatids are clearly visible in this stage.

5. Anaphase - a. Microtubules that are attached to each chromosome shorten, pulling the sister chromatids apart.

6. Telophase and Cytokinesis - c. Chromosomes that were pulled apart reach their respective poles. The chromosomes decondense. The nuclear envelope reforms. The cytoplasm with organelles divides.

Explanation-

* Interphase includes G1, S and G2 stages. Cells grow and replicate at this stage. It is the longest phase of cell cycle. DNA is decondensed and loosely distributed at this stage.

* Prophase is the first stage of mitosis. Chromatin condenses to chromosome, nuclear envelope breaks down during this stage.

* Prometaphase the second stage of mitosis. Kinetochores are formed during this stage.

* Metaphase is the third stage. Here chromosomes line up in the equatorial plane - Metaphase plate formation. Chromosomes are clearly visible at this stage.

* Anaphase is the fourth stage of mitosis. Here Chromosomes are seperated and moves to opposite poles of cell.

* Telophase and cytokinesis is the final stage. Nuclear envelope reforms, chromosomes decondense at this stage. Cytoplasm divides in cytokinesis.