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
Sex-Linked Genes
3:13 minutes
Problem 28d
Textbook Question
Textbook QuestionWhile vermilion is X-linked in Drosophila and causes the eye color to be bright red, brown is an autosomal recessive mutation that causes the eye to be brown. Flies carrying both mutations lose all pigmentation and are white-eyed. Predict the F₁ and F₂ results of the following crosses: brown females x vermilion males
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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 genes located on the X chromosome. In Drosophila, traits such as vermilion eye color are determined by alleles on this chromosome. Males, having one X and one Y chromosome, express X-linked traits directly, while females, with two X chromosomes, can be carriers or express the trait depending on their alleles.
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X-Inactivation
Autosomal Recessive Inheritance
Autosomal recessive inheritance involves genes located on non-sex chromosomes (autosomes). For a trait to be expressed, an individual must inherit two copies of the recessive allele, one from each parent. In this case, the brown eye color in Drosophila is expressed only when both alleles are brown, leading to a brown-eyed phenotype.
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Autosomal Pedigrees
Punnett Square
A Punnett square is a diagram used to predict the genotypic and phenotypic outcomes of genetic crosses. By organizing the alleles of the parents, it allows for the visualization of potential offspring combinations. This tool is essential for determining the expected ratios of traits in the F₁ and F₂ generations resulting from the given crosses.
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Chi Square Analysis
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