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
0:57 minutes
Problem 31a
Textbook Question
Textbook QuestionA woman expressing a dominant phenotype is heterozygous (Dd) for the gene.
Draw a pedigree that illustrates the transmission of the dominant trait from the grandmother to two of her grandchildren who are first cousins.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Dominant and Recessive Alleles
In genetics, alleles are different forms of a gene. A dominant allele, represented by a capital letter (e.g., D), masks the effect of a recessive allele (e.g., d) when both are present in a heterozygous individual. This means that individuals with at least one dominant allele will express the dominant phenotype, while those with two recessive alleles will express the recessive phenotype.
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Variations on Dominance
Heterozygosity
Heterozygosity refers to the presence of two different alleles at a specific gene locus, such as Dd. In the context of the question, the woman with the genotype Dd expresses the dominant phenotype due to the presence of the dominant allele. Understanding heterozygosity is crucial for predicting the inheritance patterns of traits in offspring.
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Inversions
Pedigree Analysis
A pedigree is a diagram that depicts the genetic relationships and inheritance patterns within a family. It uses standardized symbols to represent individuals and their phenotypes, allowing for the visualization of how traits are passed down through generations. In this case, drawing a pedigree will help illustrate how the dominant trait is transmitted from the grandmother to her grandchildren.
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Pedigree Flowchart
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