Cell division reinforcement worksheet showing the stages of mitosis with diagrams and descriptions.

Based on question 6: "Body cells that contain the full number of chromosomes, 46 in humans, are called ________", the answer is "diploid." Diploid cells contain two complete sets of chromosomes, one from each parent.

Now let me examine question 7: "Sex cells that contain only half the number of chromosomes are called ________"

Based on question 7: "Sex cells that contain only half the number of chromosomes are called ________", the answer is "haploid." Haploid cells contain only one set of chromosomes, which is half the number found in diploid body cells.

Now let me examine question 8: "During the stage of the cell cycle, the cell is copying DNA and performing cell functions ________"

Based on question 8: "During the stage of the cell cycle, the cell is copying DNA and performing cell functions ________", the answer is "interphase." Interphase is the phase where the cell grows, performs its normal functions, and replicates its DNA in preparation for cell division.

Now let me examine question 9: "During the stage of mitosis, chromosomes line up along the equator ________"

Based on question 9: "During the stage of mitosis, chromosomes line up along the equator ________", the answer is "metaphase." During metaphase, chromosomes align at the metaphase plate (equator) of the cell.

Now let me examine question 10: "During the stage of mitosis, chromatids separate and move to opposite poles ________"

Based on question 10: "During the stage of mitosis, chromatids separate and move to opposite poles ________", the answer is "anaphase." During anaphase, sister chromatids separate and are pulled toward opposite poles of the cell.

Now let me examine question 11: "During the stage of mitosis, chromosomes condense and form spindle fibers ________"

Based on question 11: "During the stage of mitosis, chromosomes condense and form spindle fibers ________", the answer is "prophase." During prophase, chromosomes condense, become visible, and the mitotic spindle begins to form.

Now let me examine question 12: "During this stage of mitosis, the nuclear membrane forms in each new cell ________"

Based on question 12: "During this stage of mitosis, the nuclear membrane forms in each new cell ________", the answer is "telophase." During telophase, the nuclear envelope reforms around each set of separated chromosomes.

Now let me examine question 13: "During this stage, the cytoplasm divides forming two identical daughter cells ________"

Based on question 13: "During this stage, the cytoplasm divides forming two identical daughter cells ________", the answer is "cytokinesis." Cytokinesis is the process where the cytoplasm divides, resulting in two separate daughter cells.

Now let me examine question 14: "The process by which the nucleus divides is called ________"

Based on question 14: "The process by which the nucleus divides is called ________", the answer is "mitosis." Mitosis is the process of nuclear division that results in two genetically identical nuclei.

Now let me examine question 15: "The process by which the cell splits into two new daughter cells is called ________"

Based on question 15: "The process by which the cell splits into two new daughter cells is called ________", the answer is "cytokinesis." While mitosis divides the nucleus, cytokinesis completes cell division by splitting the cytoplasm and creating two separate daughter cells.

Finally, I need to label the phases shown in the diagram. Looking at the four stages:
1. First cell: Chromosomes are condensed and visible - this is Prophase
2. Second cell: Chromosomes are aligned at the center/equator - this is Metaphase
3. Third cell: Chromosomes are separated to opposite poles - this is Anaphase
4. Fourth cell: Two daughter cells are forming - this is Telophase/Cytokinesis

# Complete Answers to Cell Division Reinforcement Worksheet:

1. These structures are found in the nucleus of dividing cells, they appear X-shaped: chromosomes
2. A chromosome is made of two identical sister: chromatids
3. Chromosomes are made of: DNA wrapped around proteins.
4. Chromosomes are found in the: nucleus of the cell
5. Sister chromatids are held together by: centromeres
6. Body cells that contain the full number of chromosomes, 46 in humans, are called: diploid
7. Sex cells that contain only half the number of chromosomes are called: haploid
8. During the stage of the cell cycle, the cell is copying DNA and performing cell functions: interphase
9. During the stage of mitosis, chromosomes line up along the equator: metaphase
10. During the stage of mitosis, chromatids separate and move to opposite poles: anaphase
11. During the stage of mitosis, chromosomes condense and form spindle fibers: prophase
12. During this stage of mitosis, the nuclear membrane forms in each new cell: telophase
13. During this stage, the cytoplasm divides forming two identical daughter cells: cytokinesis
14. The process by which the nucleus divides is called: mitosis
15. The process by which the cell splits into two new daughter cells is called: cytokinesis

Label the phases in the diagram:
- Phase 1: Prophase
- Phase 2: Metaphase
- Phase 3: Anaphase
- Phase 4: Telophase/Cytokinesis