The below mentioned article provides a close view on the expansions of Mendelian Laws:- 1. Introduction to the Expansions of Mendelian Laws 2. Multiple Alleles and Complex Loci 3. Compatibility in Certain Plans 4. Variation in Dominance Relation 5. Penetrance and Expressivity 6. Modiflying Genes 7. Pleiotropic or Many-Fold Effects of a Single Gene 8. Gene Interactions. Contents: Introduction to [...]
The below mentioned article provides a study note on the Linkage of Genes. When Mendel's work was rediscovered, thousands of experiments were conducted by the early biologists on the diverse groups of plants and animals. The results obtained in those cases were quite contrary to the principles of independent assortment, but none of the interpretations was good enough to justify [...]
The following points highlight the four theories proposed for the mechanism of crossing over. The theories are: 1. Janssen's Classical Theory 2. Belling's Copy Choice Theory 3. Uhl's Theory 4. Darlington's Theory of Crossing Over. Theory # 1. Janssen's Classical Theory: Janssen (1909) believed that prior to the formation of chiasmata the homologous maternal and paternal chromosomes come in pair [...]