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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Multiple Choice

During prophase I of meiosis, how many chromosomes are present in a human cell?

69 chromosomes

23 chromosomes

92 chromosomes

46 chromosomes

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Verified step by step guidance

Understand that meiosis is a type of cell division that reduces the chromosome number by half, resulting in four daughter cells. It consists of two stages: meiosis I and meiosis II.

Recall that human cells typically have 46 chromosomes, which are organized into 23 pairs. This is the diploid number of chromosomes.

During prophase I of meiosis, the cell is preparing to divide. At this stage, the chromosomes have already been replicated during the preceding interphase, but they are still counted as 46 chromosomes because they are in pairs.

In prophase I, homologous chromosomes pair up in a process called synapsis, forming tetrads. Each tetrad consists of four chromatids, but the number of chromosomes remains 46.

Therefore, during prophase I of meiosis in a human cell, there are 46 chromosomes present, as the cell is still in the diploid state before the division process reduces the chromosome number.