Table of contents

1. Introduction to Anatomy & Physiology5h 43m
2. Cell Chemistry & Cell Components12h 36m
3. Energy & Cell Processes10h 6m
4. Tissues & Histology10h 3m
5. Integumentary System2h 20m
6. Bones & Skeletal Tissue2h 16m
7. The Skeletal System2h 35m
8. Joints2h 17m
9. Muscle Tissue2h 33m
10. Muscles1h 11m
11. Nervous Tissue and Nervous System1h 35m
12. The Central Nervous System1h 6m
- Introduction to the Central Nervous System
  18m
- The Cerebrum
  48m
13. The Peripheral Nervous System1h 26m
14. The Autonomic Nervous System1h 38m
15. The Special Senses2h 41m
16. The Endocrine System2h 48m
17. The Blood3h 22m
18. The Heart3h 42m
19. The Blood Vessels3h 35m
20. The Lymphatic System3h 16m
21. The Immune System14h 37m
22. The Respiratory System3h 20m
23. The Digestive System2h 5m
24. Metabolism and Nutrition4h 0m
25. The Urinary System2h 39m
26. Fluid and Electrolyte Balance, Acid Base Balance37m
27. The Reproductive System2h 5m
28. Human Development1h 21m
29. Heredity3h 32m

3. Energy & Cell Processes

Phases of Mitosis

Anatomy & Physiology

3. Energy & Cell Processes

Phases of Mitosis

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1:15 minutes

Problem 12

Textbook Question

In the light micrograph below of dividing cells near the tip of an onion root, identify a cell in interphase, prophase, metaphase, anaphase, and telophase. Describe the major events occurring at each stage.

Verified step by step guidance

Identify a cell in interphase: Look for a cell with a clearly defined nucleus and no visible chromosomes. The cell will appear to be in a resting state with a uniform nuclear appearance.

Identify a cell in prophase: Look for a cell where the chromatin is condensing into visible chromosomes. The nuclear membrane will start to disintegrate, and the chromosomes will appear as distinct structures.

Identify a cell in metaphase: Look for a cell where the chromosomes are aligned at the cell's equatorial plate. The chromosomes will be lined up in the center of the cell, preparing for separation.

Identify a cell in anaphase: Look for a cell where the sister chromatids are being pulled apart toward opposite poles of the cell. The chromosomes will appear to be moving away from the center.

Identify a cell in telophase: Look for a cell where the chromosomes have reached the opposite poles and are starting to de-condense. The nuclear membrane will begin to re-form around each set of chromosomes, and the cell will start to divide.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Cell Cycle Stages

The cell cycle consists of several stages, including interphase and the mitotic phases (prophase, metaphase, anaphase, and telophase). Interphase is the phase where the cell prepares for division, while the mitotic phases involve the actual process of cell division. Understanding these stages is crucial for identifying the specific phase a cell is in during observation.

Chromosome Behavior

During mitosis, chromosomes undergo significant changes. In prophase, chromosomes condense and become visible, while in metaphase, they align at the cell's equatorial plane. Anaphase involves the separation of sister chromatids, and in telophase, the chromatids reach opposite poles and begin to de-condense. Recognizing these behaviors helps in identifying the stages in the light micrograph.

Light Microscopy

Light microscopy is a technique used to visualize cells and their structures. It allows for the observation of cellular details, such as the arrangement of chromosomes during mitosis. Understanding how to interpret light micrographs is essential for accurately identifying the stages of cell division and the characteristics of cells in each phase.