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

29. Heredity

Patterns of Inheritance

Anatomy & Physiology

29. Heredity

Patterns of Inheritance

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Multiple Choice

Which of the following statements best describes epistasis?

An allele that changes the genotype of another allele.

A gene that changes the genotype of another gene.

A gene that controls or masks the expression of another gene.

A gene that changes the genotype of the organism.

None of the above.

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Verified step by step guidance

Step 1: Begin by understanding the term 'epistasis.' Epistasis refers to the interaction between genes, where one gene can mask or modify the expression of another gene. This is different from dominance, which occurs between alleles of the same gene.

Step 2: Analyze the options provided in the question. The correct description of epistasis should involve the concept of one gene controlling or masking the expression of another gene, not altering genotypes.

Step 3: Eliminate incorrect options systematically. For example, 'An allele that changes the genotype of another allele' is incorrect because epistasis involves interactions between genes, not alleles. Similarly, 'A gene that changes the genotype of another gene' and 'A gene that changes the genotype of the organism' are incorrect because epistasis affects gene expression, not genotypes.

Step 4: Focus on the correct option: 'A gene that controls or masks the expression of another gene.' This aligns with the definition of epistasis, where one gene influences the phenotypic expression of another gene.

Step 5: Conclude that the correct answer is the option describing epistasis as 'A gene that controls or masks the expression of another gene,' as this accurately reflects the concept in genetics.