Question

You are reading a history of science text that describes abandoned scientific hypotheses. The text details Hartsoeker’s “preformation” theory of development and says that this theory is absurd. Based on what you have learned in class, you decide to write the author to show him the error of his ways. Develop the main point you would like to convey to the author concerning how preformation, understood in a different way, is a valid hypothesis.

Answer 1

Pre - formation rightarrow (i) Pre - formation is done with the help of simple inorganic molecules. When these inorganic molecule come in to contact in ocean water they combined and form simple organic compound like Amino acids, Lipids and Monosaccharides. rightarrow After their formation Pre - cells (coservates) or (Protobiont) formed And from this Pre - cells, simple cell formed (according to Harold Urey & stanley miller experiment) rightarrow Urey and miller use CH_4, NH_3 and H_2 (ratio 2: 1: 2) and created electric discharge by using two tungsten electrodes as source of energy in water vapour at 800 degree C in a large flask. they observed the formation of simple Amino acids like glycine, alanine and Aspartic acid. rightarrow Many other evidences show Pre - formation with this method ex- Origin of Protobionts - origin of proto cells (Eobionts) - Oparin.s coacervates etc. rightarrow After formation of simple cells evolution went through simple to complex and multi cellular organism formed.