Inheritance is the process of transfer of hereditary character from parents to the offsprings. This is due to the inheritance that the two parents and their offsprings are more or less similar. We can easily distinguish the offsprings by observing with the parents face. It was Gregor Mendel who brought the concept of inheritance. Before him were also different philosopher as well as scholars gave their own opinion and gave their theory. All these theory are collectively known as pre mendelian view or theory. The pre mendelian views are as follows.
1. Moist vapour theory : This theory was proposed by a Greek philosopher Pythagoras. According to this theory a certain moist vapour is transmitted from the male towards the female during the fertilization and it develops into an embryo. From where the later new organism is developed.
2. Proformation theory: This is one of the famous theory at that time proposed by A.V levenhoek. According to this theory every living organism contain a certain small miniature like living organisms in their gametes. When this gamete fused themselves they form a new living organisms. This small living organism is known as homunculus.
3. Fluid theory : Empedocles has put this theory forward. This theory is very simple and clear. It says that every living organism possess a certain fluid as their parental property and when this fluids mix up they form a new living organism.
4. Reproductive fluid theory : This theory says that a certain reproductive fluid flows from the male i.e semen, which is very pure and from female also a certain reproductive fluid flows out. This fluid is impure and when this blood mix and coagulate, a new organism is formed. But as the female has impure fluid . The male character is dominant over female.
5. Epigenesis : This is one of the most accepted and true theory. According to this theory it says that the living organisms do not contain homunculus but the gamete does contain some of the basic living organism. Due to which the development of new organism takes place. It was proposed by K.F Wolff. And it is one of the true stating theory of that time.
6. Pangenesis : This is one of the another premendilian theory. Proposed by Charles Darwin. According to this theory it says that in our body different tissues and cells contain different small microscopic particles and this is known as gemmule. This are developed into different organs on the mode of the division. Due to which the organisms are developed as in the form of a highly developed organism.
Hence this are the premendilian views that was discarded because of the main drawbacks and the main drawback is Atavision this a kind of inheritance. According to which the character which is possess by grand parents is not shown by their offsprings but by their grand children. So the theory need to meet this expectations that they were unable to fulfill. Due to which the most of the theory of the premendilian was discarded today.
0 comments:
Post a Comment