Download e-book for kindle: General Genetics by M. J. Sirks (auth.)

By M. J. Sirks (auth.)

ISBN-10: 9401575878

ISBN-13: 9789401575874

ISBN-10: 9401700435

ISBN-13: 9789401700436

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Previously) formed, that is to say, preformed. e. an unfolding, an evolution of already long determined forms and organs. This preformation could be situated in the material, handed over by the male parental organism. Among the many "animalculists" who advocated this we will name only LEEUWENHOEK and BOERHAVE (Dutch scientists) who held a place of importance, whereas SwAMMERDAM and other famous investigators belonged to the "ovists", who PREMENDELIAN THEORIES OF GENETICS 49 believed that the preformed state must be found in the egg, that is to say, in a part of the mother.

Hence an absolute average = 53·671 and the standard deviation cr = ± 2·131 can be calculated. It must be stressed that the choice of the provisional average cannot influence the final result. By whatever means this provisional average is fixed, the values of and cr will always be the same. To sum up, there are two important points to be noted when dealing with frequency-distribution: Firstly: the Median (Med) and the Quartile (Q) are in some cases sufficient and may be preferred in view of their simplicity in calculations.

If a distinct character is investigated in a hundred cases, and we find concordance in ninety twins between the twin partners, and in ten cases there is discordance, whereas from the hundred FT's there are perhaps ten concordant and ninety discordant. In this case, the strong concordance between the IT's and the slender concordance between the FT's for this character gives the right to consider the character as being highly heritable. Moreover, we can gain some idea from the percentages of concordance and discordance, of the influencing power of the environment.

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General Genetics by M. J. Sirks (auth.)

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