Heredity and sex . in certainlimits. But we cannot conclude, as I have said, that thisprocess can make any permanent contribution to evolu-tion. It is true that Weismann has advanced the hy-pothesis that such recombinations furnish the materialsfor evolution, but as I have said there is no evidencethat supports or even makes plausible his contention. I bring up again this point to emphasize that while theconclusion we arrived at — a provisional conclusion atbest — may help us to understand how sexual repro-duction might be beneficial to a species in maintainingitself, it cannot be utilized to
Heredity and sex . in certainlimits. But we cannot conclude, as I have said, that thisprocess can make any permanent contribution to evolu-tion. It is true that Weismann has advanced the hy-pothesis that such recombinations furnish the materialsfor evolution, but as I have said there is no evidencethat supports or even makes plausible his contention. I bring up again this point to emphasize that while theconclusion we arrived at — a provisional conclusion atbest — may help us to understand how sexual repro-duction might be beneficial to a species in maintainingitself, it cannot be utilized to explain the progressiveadvances that we must believe to have taken placeduring evolution. 20 HEREDITY AND SEX THE EARLY ISOLATION OF THE GERM-CELLS There is much evidence to show that the germ-cellsappear very early in the development of the individualwhen they are set aside from the cells that differentiateinto the body cells. This need not mean that the germ-cells have remained unmodified, although this is at.
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Keywords: ., boo, bookcentury1900, bookdecade1910, booksubjectsex, bookyear1913
