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
2. Mendel's Laws of Inheritance
Pedigrees
1:49 minutes
Problem 3e
Textbook Question
Textbook QuestionA couple comes into your genetic counseling practice with a question about the chance a future child of theirs might have a genetic disease. Three or four men in the woman's family, including her father, had a condition that might be genetic. Although her father is still alive, she has had little contact with him for much of her life and cannot describe or name the condition. Her partner is a healthy man whose family has no history indicating the presence of a genetic condition. To provide more information about this possible genetic condition for the couple, what is the first step you recommend?
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Family History Assessment
A thorough family history assessment is crucial in genetic counseling. It involves gathering detailed information about the health conditions of family members, particularly those related to genetic diseases. This helps identify patterns of inheritance and potential risks for future offspring. In this case, understanding the woman's father's condition and its inheritance pattern is essential for evaluating the risk to their future child.
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Autosomal Dominant and Recessive Inheritance
Understanding the principles of autosomal dominant and recessive inheritance is vital in genetic counseling. Autosomal dominant conditions require only one copy of the mutated gene from an affected parent to manifest, while autosomal recessive conditions require two copies. Since the woman's father has a condition that may be genetic, determining whether it follows one of these inheritance patterns will help assess the likelihood of their child inheriting the condition.
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Genetic Testing Options
Genetic testing can provide valuable information about the risk of inherited conditions. In this scenario, recommending genetic testing for the woman could help identify whether she carries a mutation associated with her father's condition. This information is crucial for understanding the potential risks to their future child and can guide the couple in making informed reproductive choices.
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