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

27. The Reproductive System

Introduction to the Reproductive System

Anatomy & Physiology

27. The Reproductive System

Introduction to the Reproductive System

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Multiple Choice

What is the Barr body in the context of X-inactivation?

A gene responsible for determining sex

A structure found in male cells

A protein that initiates X-inactivation

An inactivated X chromosome in a female cell

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Verified step by step guidance

Understand that in humans, females have two X chromosomes (XX) while males have one X and one Y chromosome (XY).

Recognize that X-inactivation is a process that occurs in female cells to ensure dosage compensation, meaning that females do not have twice the number of X-linked gene products as males.

Learn that during X-inactivation, one of the two X chromosomes in each cell is randomly chosen to be inactivated. This inactivated X chromosome condenses into a compact structure known as a Barr body.

Note that the Barr body is typically found in the nucleus of female cells and is not present in male cells, as males have only one X chromosome.

Remember that the Barr body is an example of how cells regulate gene expression to maintain balance between the sexes, ensuring that females, like males, have one functional set of X-linked genes.