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

Overview of Human Genetics

Anatomy & Physiology

29. Heredity

Overview of Human Genetics

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Multiple Choice

An allele that exerts its effects whenever it is present is:

Recessive.

Heterozygous.

Dominant.

Homozygous.

Homologous.

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Verified step by step guidance

Understand the concept of an allele: An allele is a variant form of a gene. Each individual inherits two alleles for each gene, one from each parent.

Learn the definition of a dominant allele: A dominant allele is one that exerts its effects and determines the phenotype whenever it is present, regardless of whether the other allele is dominant or recessive.

Contrast dominant alleles with recessive alleles: A recessive allele only exerts its effects when paired with another recessive allele (homozygous recessive). If paired with a dominant allele, the dominant allele will mask the effects of the recessive allele.

Review the term heterozygous: Heterozygous refers to having two different alleles for a gene, one dominant and one recessive. In this case, the dominant allele will determine the phenotype.

Understand why 'dominant' is the correct answer: The problem asks for the type of allele that exerts its effects whenever it is present. By definition, this is a dominant allele, as it influences the phenotype regardless of the other allele present.