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 [...]
In this article we will discuss about:- 1. Meaning of Three Point Test Cross 2. Calculation of Three Point Test Cross 3. Recombination 4. Gene Sequence 5. Coefficient of Coincidence. Contents: Meaning of Three Point Test Cross Calculation of Three Point Test Cross Recombination (%) of Three Point Test Cross Gene Sequence of Three Point Test Cross Coefficient of Coincidence [...]
In this article we will discuss about:- 1. Meaning of Crossing Over 2. Feature of Crossing Over 3. Relationship between Crossing Over and Chiasma Formation 4. Molecular Mechanism 5. Types 6. Factors Affecting 7. Cytological Proof 8. Significance. Contents: Meaning of Crossing Over Feature of Crossing Over Relationship between Crossing Over and Chiasma Formation Molecular Mechanism of Crossing Over Types [...]