The Method of Evolution; a Review of the Present Attitude of Science Toward the Question of the Laws And Forces Which Have Brought About the Origin of Species
The book The Method of Evolution; a Review of the Present Attitude of Science Toward the Question of the Laws And Forces Which Have Brought About the Origin of Species was written by author Conn, H. W. (Herbert William), B. 1859 Here you can read free online of The Method of Evolution; a Review of the Present Attitude of Science Toward the Question of the Laws And Forces Which Have Brought About the Origin of Species book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is The Method of Evolution; a Review of the Present Attitude of Science Toward the Question of the Laws And Forces Which Have Brought About the Origin of Species a good or bad book?
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It may have entered the egg before this stage but remained dormant until now. After it enters we find, in some cases at least, that the egg centrosome disappears and thus the egg contains only the one centrosome which has been brought in by the spermatozoon. This centrosome now begins to show signs of activity, and it soon brings together the egg nucleus, with its remaining chromosomes, and the spermatozoon head containing its equal number of chromosomes (Fig. 19). These two masses of chromosom...es, however, break up into a network and are then brought in contact near the middle of the egg. The centrosome now divides into two parts which pass to the opposite sides of the central mass of chromosomes (Fig. 20). This is the fertilization and marks the beginning of the life of the new individual. Before describing the next steps we must notice two important conclusions which are to be derived from the phenomena. First the facts given practi- cally demonstrate that it must be the chromosomes which constitute the physical basis of heredity.
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