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
Probability and Genetics
2:51 minutes
Problem 17a
Textbook Question
Textbook QuestionThe coat color in mink is controlled by two codominant alleles at a single locus. Red coat color is produced by the genotype R₁R₁, silver coat by the genotype R₁R₂, and platinum color by R₂R₂. White spotting of the coat is a recessive trait found with the genotype ss. Solid coat color is found with the S– genotype.
What are the expected progeny phenotypes and proportions for the cross SsR₁R₂ x ssR₂R₂?
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Codominance
Codominance occurs when two different alleles at a locus are both expressed in the phenotype of a heterozygote. In the case of mink coat color, the alleles R₁ and R₂ are codominant, meaning that both can contribute to the phenotype when present together, resulting in a distinct coat color that is different from either homozygous condition.
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Variations on Dominance
Genotype and Phenotype
The genotype refers to the genetic makeup of an organism, while the phenotype is the observable physical or biochemical characteristics. In the given question, the genotypes (e.g., R₁R₁, R₁R₂, R₂R₂, ss) determine the phenotypes (e.g., red, silver, platinum, white spotting) of the mink, illustrating the relationship between genetics and observable traits.
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Punnett Square
A Punnett square is a diagram used to predict the genotypes and phenotypes of offspring from a genetic cross. By organizing the alleles of the parents (in this case, SsR₁R₂ and ssR₂R₂) into a grid, one can easily visualize the potential combinations and calculate the expected proportions of each phenotype in the progeny.
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