Genetics and Heredity

  1. Extensions and Variations of Mendelian Inheritance
    1. Beyond Simple Dominance
      1. Incomplete Dominance
        1. Definition and Examples
          1. Molecular Basis
            1. Phenotypic Ratios
            2. Codominance
              1. Definition and Examples
                1. ABO Blood Groups
                  1. Molecular Basis
                  2. Overdominance
                    1. Heterozygote Advantage
                      1. Examples in Nature
                    2. Multiple Alleles
                      1. Concept of Multiple Alleles
                        1. The ABO Blood Group System
                          1. IA, IB, and i Alleles
                            1. Phenotypes and Genotypes
                              1. Inheritance Patterns
                              2. Other Examples
                                1. Coat Color in Rabbits
                                  1. Self-Incompatibility in Plants
                                2. Gene Interactions
                                  1. Epistasis
                                    1. Recessive Epistasis
                                      1. Dominant Epistasis
                                        1. Complementary Epistasis
                                          1. Suppressor Epistasis
                                            1. Modified Ratios
                                            2. Pleiotropy
                                              1. Single Gene, Multiple Effects
                                                1. Examples of Pleiotropic Genes
                                                2. Complementary Genes
                                                  1. Gene Complementation
                                                    1. Biochemical Pathways
                                                    2. Duplicate Genes
                                                      1. Functional Redundancy
                                                        1. Modified Ratios
                                                      2. Polygenic Inheritance
                                                        1. Quantitative Traits
                                                          1. Continuous Variation
                                                            1. Normal Distribution
                                                              1. Additive Effects
                                                              2. Examples of Polygenic Traits
                                                                1. Human Height
                                                                  1. Skin Color
                                                                    1. Intelligence
                                                                    2. Heritability
                                                                      1. Broad-Sense Heritability
                                                                        1. Narrow-Sense Heritability
                                                                      2. Environmental Effects on Phenotype
                                                                        1. Penetrance
                                                                          1. Complete Penetrance
                                                                            1. Incomplete Penetrance
                                                                            2. Expressivity
                                                                              1. Variable Expressivity
                                                                                1. Factors Affecting Expression
                                                                                2. Phenotypic Plasticity
                                                                                  1. Environmental Influences
                                                                                    1. Gene-Environment Interactions
                                                                                    2. Epigenetic Effects
                                                                                      1. DNA Methylation
                                                                                        1. Histone Modifications
                                                                                          1. Environmental Triggers

                                                                                      Previous

                                                                                      4. Chromosomes and Cell Division

                                                                                      Go to top

                                                                                      Next

                                                                                      6. Linkage, Crossing Over, and Gene Mapping