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
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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.
What to read after 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?
You can find similar books in the "Read Also" column, or choose other free books by Conn, H. W. (Herbert William), B. 1859 to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
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.
What to read after 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?
You can find similar books in the "Read Also" column, or choose other free books by Conn, H. W. (Herbert William), B. 1859 to read onlineMoreLess
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