The following points highlight the four main developmental organs in vertebrates. The developmental organs are: 1. Brain 2. Eye 3. Heart 4. Kidney. Developmental Organ # 1. Brain: The first important morphogenetic change following gastrulation is the development of the central nervous system. The central nervous system starts as a simple tubular nerve tube which, in course of development, transforms [...]
In this article we will discuss about:- 1. Meaning of Crossing Over 2. Double Cross-Over 3. Cytological Basis 4. Cytological Evidence 5. Somatic Crossover 6. Different Theories on the Mechanism 7. Theories that Explain the Happenings 8. Chiasma Formation—the Theories 9. No Cross-over in Drosophila Males 10. Experimental Conditions. Contents: Meaning of Crossing Over Double Cross-Over Cytological Basis of Crossing [...]
In this article we will discuss about the stratification of typical forest and lentic water. Stratification of a Typical Forest: A forest community is a typical example of terrestrial stratification because here a number of strata both above and below the soil can be recognised. A forest bears an over story stratum. This stratum is composed of trees which are [...]