Table of contents
- 1. Introduction to Biology2h 40m
- 2. Chemistry3h 40m
- 3. Water1h 26m
- 4. Biomolecules2h 23m
- 5. Cell Components2h 26m
- 6. The Membrane2h 31m
- 7. Energy and Metabolism2h 0m
- 8. Respiration2h 40m
- 9. Photosynthesis2h 49m
- 10. Cell Signaling59m
- 11. Cell Division2h 47m
- 12. Meiosis2h 0m
- 13. Mendelian Genetics4h 41m
- Introduction to Mendel's Experiments7m
- Genotype vs. Phenotype17m
- Punnett Squares13m
- Mendel's Experiments26m
- Mendel's Laws18m
- Monohybrid Crosses16m
- Test Crosses14m
- Dihybrid Crosses20m
- Punnett Square Probability26m
- Incomplete Dominance vs. Codominance20m
- Epistasis7m
- Non-Mendelian Genetics12m
- Pedigrees6m
- Autosomal Inheritance21m
- Sex-Linked Inheritance43m
- X-Inactivation9m
- 14. DNA Synthesis2h 27m
- 15. Gene Expression3h 20m
- 16. Regulation of Expression3h 31m
- Introduction to Regulation of Gene Expression13m
- Prokaryotic Gene Regulation via Operons27m
- The Lac Operon21m
- Glucose's Impact on Lac Operon25m
- The Trp Operon20m
- Review of the Lac Operon & Trp Operon11m
- Introduction to Eukaryotic Gene Regulation9m
- Eukaryotic Chromatin Modifications16m
- Eukaryotic Transcriptional Control22m
- Eukaryotic Post-Transcriptional Regulation28m
- Eukaryotic Post-Translational Regulation13m
- 17. Viruses37m
- 18. Biotechnology2h 58m
- 19. Genomics17m
- 20. Development1h 5m
- 21. Evolution3h 1m
- 22. Evolution of Populations3h 52m
- 23. Speciation1h 37m
- 24. History of Life on Earth2h 6m
- 25. Phylogeny2h 31m
- 26. Prokaryotes4h 59m
- 27. Protists1h 12m
- 28. Plants1h 22m
- 29. Fungi36m
- 30. Overview of Animals34m
- 31. Invertebrates1h 2m
- 32. Vertebrates50m
- 33. Plant Anatomy1h 3m
- 34. Vascular Plant Transport2m
- 35. Soil37m
- 36. Plant Reproduction47m
- 37. Plant Sensation and Response1h 9m
- 38. Animal Form and Function1h 19m
- 39. Digestive System10m
- 40. Circulatory System1h 57m
- 41. Immune System1h 12m
- 42. Osmoregulation and Excretion50m
- 43. Endocrine System4m
- 44. Animal Reproduction2m
- 45. Nervous System55m
- 46. Sensory Systems46m
- 47. Muscle Systems23m
- 48. Ecology3h 11m
- Introduction to Ecology20m
- Biogeography14m
- Earth's Climate Patterns50m
- Introduction to Terrestrial Biomes10m
- Terrestrial Biomes: Near Equator13m
- Terrestrial Biomes: Temperate Regions10m
- Terrestrial Biomes: Northern Regions15m
- Introduction to Aquatic Biomes27m
- Freshwater Aquatic Biomes14m
- Marine Aquatic Biomes13m
- 49. Animal Behavior28m
- 50. Population Ecology3h 41m
- Introduction to Population Ecology28m
- Population Sampling Methods23m
- Life History12m
- Population Demography17m
- Factors Limiting Population Growth14m
- Introduction to Population Growth Models22m
- Linear Population Growth6m
- Exponential Population Growth29m
- Logistic Population Growth32m
- r/K Selection10m
- The Human Population22m
- 51. Community Ecology2h 46m
- Introduction to Community Ecology2m
- Introduction to Community Interactions9m
- Community Interactions: Competition (-/-)38m
- Community Interactions: Exploitation (+/-)23m
- Community Interactions: Mutualism (+/+) & Commensalism (+/0)9m
- Community Structure35m
- Community Dynamics26m
- Geographic Impact on Communities21m
- 52. Ecosystems2h 36m
- 53. Conservation Biology24m
13. Mendelian Genetics
Sex-Linked Inheritance
1:35 minutes
Problem 9a
Textbook Question
Textbook QuestionA woman is a carrier of the X-linked recessive color blindness gene. She has children with a man with normal color vision. Which of the following is true of their offspring? a. All the males will be color blind; b. All the females will be carriers; c. Half the females will be color blind; d. Half the males will be color blind.
Verified step by step guidance
1
Understand the genetics involved: Color blindness is an X-linked recessive trait. This means the gene causing color blindness is located on the X chromosome and is recessive.
Analyze the mother's genotype: Since the woman is a carrier and not color blind, her genotype must be XcX, where Xc represents the X chromosome carrying the color blindness gene.
Analyze the father's genotype: The man has normal color vision and thus his genotype is XY, where Y represents the Y chromosome which does not carry the color blindness gene.
Determine the possible genotypes of the offspring: The mother can pass on either Xc or X, and the father can pass on either X or Y. This results in four possible combinations for their children: XcX, XX, XcY, XY.
Conclude the probabilities: From the combinations, XcY represents a color blind male (since Y does not mask the recessive Xc), and XY represents a normal male. Thus, half of the male children (XcY and XY) will be color blind, making option 'd' correct.
Recommended similar problem, with video answer:
Verified Solution
This video solution was recommended by our tutors as helpful for the problem above
Video duration:
1mPlay a video:
Was this helpful?
Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
X-linked Inheritance
X-linked inheritance refers to the pattern of genetic transmission of traits located on the X chromosome. In this case, color blindness is an X-linked recessive trait, meaning that males (who have one X and one Y chromosome) are more likely to express the trait if they inherit the affected X chromosome, while females (who have two X chromosomes) can be carriers if they have one affected X chromosome.
Recommended video:
Guided course
07:23
X-Linked Inheritance
Carrier Status
A carrier is an individual who possesses one copy of a recessive allele that does not manifest in their phenotype. In this scenario, the woman is a carrier of the color blindness gene, meaning she has one normal X chromosome and one affected X chromosome. This status allows her to pass the affected allele to her offspring without being color blind herself.
Recommended video:
Guided course
05:22
Electron Carriers: NADH & FADH2
Punnett Square
A Punnett square is a diagram used to predict the genetic outcomes of a cross between two individuals. By setting up a Punnett square for this scenario, we can visualize the potential genotypes of the offspring, helping to determine the likelihood of color blindness in males and carrier status in females based on the parents' genotypes.
Recommended video:
Guided course
01:37
Punnett Squares
Watch next
Master Sex-Linked Inheritance with a bite sized video explanation from Jason Amores Sumpter
Start learningRelated Videos
Related Practice