A tumor is a growing mass of abnormal cells. Describe the difference between a benign tumor and a malignant tumor.
Table of contents
- 1. Introduction to Genetics51m
- 2. Mendel's Laws of Inheritance3h 37m
- 3. Extensions to Mendelian Inheritance2h 41m
- 4. Genetic Mapping and Linkage2h 28m
- 5. Genetics of Bacteria and Viruses1h 21m
- 6. Chromosomal Variation1h 48m
- 7. DNA and Chromosome Structure56m
- 8. DNA Replication1h 10m
- 9. Mitosis and Meiosis1h 34m
- 10. Transcription1h 0m
- 11. Translation58m
- 12. Gene Regulation in Prokaryotes1h 19m
- 13. Gene Regulation in Eukaryotes44m
- 14. Genetic Control of Development44m
- 15. Genomes and Genomics1h 50m
- 16. Transposable Elements47m
- 17. Mutation, Repair, and Recombination1h 6m
- 18. Molecular Genetic Tools19m
- 19. Cancer Genetics29m
- 20. Quantitative Genetics1h 26m
- 21. Population Genetics50m
- 22. Evolutionary Genetics29m
19. Cancer Genetics
Overview of Cancer
Problem 6
Textbook Question
What is the difference between saying that cancer is inherited and saying that the predisposition to cancer is inherited?

1
Understand the distinction between 'inherited cancer' and 'inherited predisposition to cancer': Inherited cancer means that the cancer itself is directly passed down from parent to offspring, which is rare. In contrast, an inherited predisposition to cancer means that genetic mutations or variations increasing the likelihood of developing cancer are passed down, but the cancer itself is not guaranteed to occur.
Explain the concept of genetic predisposition: A predisposition to cancer involves inheriting specific genetic mutations (e.g., mutations in the BRCA1 or BRCA2 genes) that increase the risk of developing cancer. These mutations do not directly cause cancer but make it more likely under certain environmental or lifestyle conditions.
Clarify the role of environmental and lifestyle factors: Even with an inherited predisposition, cancer development often requires additional factors, such as exposure to carcinogens, smoking, or other environmental influences, which interact with the genetic predisposition.
Provide examples of inherited predispositions: For instance, mutations in the BRCA1 or BRCA2 genes are associated with a higher risk of breast and ovarian cancers, while mutations in the APC gene are linked to familial adenomatous polyposis, a condition that increases the risk of colorectal cancer.
Summarize the key difference: Inherited cancer implies direct transmission of the disease, which is rare, while inherited predisposition refers to the transmission of genetic factors that increase the likelihood of developing cancer, requiring additional factors for the disease to manifest.

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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Genetic Inheritance
Genetic inheritance refers to the process by which traits and characteristics are passed from parents to offspring through genes. This includes both dominant and recessive alleles that can influence the likelihood of developing certain conditions, including diseases like cancer. Understanding this concept is crucial for distinguishing between direct inheritance of a disease and the inheritance of susceptibility.
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Cancer Genetics
Cancer genetics studies the role of genetic mutations and variations in the development of cancer. Some cancers are caused by inherited mutations in specific genes, while others arise from mutations acquired during a person's lifetime. Recognizing the difference between inherited cancer and predisposition helps clarify the mechanisms behind cancer development and the importance of genetic testing.
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Cancer Characteristics
Predisposition vs. Direct Inheritance
Predisposition to cancer means that an individual has an increased risk of developing cancer due to inherited genetic factors, but it does not guarantee that they will develop the disease. In contrast, saying that cancer is inherited implies that the disease itself is passed down directly, which is not always the case. This distinction is vital for understanding risk factors and the implications for family members.
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