Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Preformation Theory (1632-1723)
(i) Scientist 'Malpighi Swammerdam' propounded the preformation theory. This theory holds that the sex cells (sperm and ova) had the miniature copy of adults and the development of embryo was actually only the enlargement of parts that were already present in the sperm or egg.
(ii) This miniature form of the animal present in the gamete was called 'Homunculus'.
(iii) This theory was supported by Hartsoeker.
(iv) Those who considered homunculus to be present is sperms were called Spermist.
(v) Leeuwenhoek & Hartsoeker believed that miniature of organism was present in the head of the sperm.
(vi) Those who considered homunculus to be present in ova (eggs) were called Ovist.
(vii) The term preformation covers the both.
(viii) Malpighi, Swammerdam & Bonnet believed that miniature organism was present in the egg.
Explain An Overview of Water Soluble Vitamins? Vitamins, we already know, are classified by the materials in which they will dissolve. Fat-soluble vitamins -vitamin A, D, E a
Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4
Synthesis of fatty acids requires the movement of citrate out of the mitochondria. This occurs under conditions of high levels of acetyl CoA which is needed to stimulate the activi
what is the economic importance of obelia
Q. How does sexual reproduction take place in bacteria? How dissimilar are the modalities of bacterial sexual reproduction? Sexual reproduction occurs when bacteria incorporate
Explain the Interaction of Vitamin A with Vitamin E? Of the various nutrients, the interaction of vitamin E, proteins, zinc and iron with vitamin A is of significance. Know? Le
International support to control HPAI and other TADs In 2008, a new global approach called "One World, One Health" was defined by the four international technical agencies, i.e
Why is the human placenta referred to as haemochorial type? Name the hormone it secretes to facilitate parturition.
What is Glycolysis in Cell Metabolism? Glycolysis : is the process that breaks down glucose into pyruvate and energy. Glycolysis does not require the presence of oxygen and
Echocardiography is a very important tool in diagnosis of cardiovascular diseases and is used virtually in all categories of cardiovascular diseases. There are certain areas where
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd