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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

Introduction to the Cell Cycle

Anatomy & Physiology

3. Energy & Cell Processes

Introduction to the Cell Cycle

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Multiple Choice

How many copies of each gene are present in human skin cells at the G2 phase of interphase?

One copy

Two copies

Eight copies

Four copies

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Verified step by step guidance

Understand the cell cycle phases: The cell cycle consists of interphase (G1, S, G2) and mitotic phase (M). During interphase, the cell prepares for division.

Focus on the G2 phase: In the G2 phase, the cell has already completed DNA replication during the S phase, resulting in duplicated chromosomes.

Recognize the chromosome structure: Each chromosome consists of two sister chromatids after DNA replication, meaning each gene is duplicated.

Determine the number of gene copies: Since each chromosome has two sister chromatids, there are two copies of each gene per chromatid, totaling four copies per chromosome.

Apply this understanding to human skin cells: Human skin cells are diploid, meaning they have two sets of chromosomes. Therefore, in the G2 phase, each gene has four copies.