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单词 apogamy
例句 apogamy
Passing on now to apogamy, or isolation of the indiscriminate kind, we may well be disposed, at first sight, to conclude that this kind of isolation can count for nothing in the process of evolution. Darwin, and After Darwin (Vol 3 of 3) Post-Darwinian Questions: Isolation and Physiological Selection 2011-10-18T02:00:18.363Z
The last-mentioned case has been regarded as representing an apogamous development of the sporophyte from the gametophyte comparable to the cases of apogamy described in Ferns. Encyclopaedia Britannica, 11th Edition, Volume 2, Part 1, Slice 1
This essay deals only with one of the many different forms of isolation—the geographical—and is therefore throughout concerned with a consideration of diversity as arising from apogamy alone. Darwin, and After Darwin (Vol 3 of 3) Post-Darwinian Questions: Isolation and Physiological Selection 2011-10-18T02:00:18.363Z
But of course this does not hinder that under apogamy various other causes of homogamy are likely to arise—in particular natural selection. Darwin, and After Darwin (Vol 3 of 3) Post-Darwinian Questions: Isolation and Physiological Selection 2011-10-18T02:00:18.363Z
Except where very large populations are concerned, indiscriminate isolation always tends to become increasingly discriminate; and, in the measure that it does so, apogamy passes into homogamy, by virtue of Independent Variability. Darwin, and After Darwin (Vol 3 of 3) Post-Darwinian Questions: Isolation and Physiological Selection 2011-10-18T02:00:18.363Z
It was in order to recognize this additional and very important factor that I chose the name Independent Variability whereby to designate the diversifying influence of merely indiscriminate isolation, or apogamy. Darwin, and After Darwin (Vol 3 of 3) Post-Darwinian Questions: Isolation and Physiological Selection 2011-10-18T02:00:18.363Z
And, of course, as soon as this change of type begins, the isolation ceases to be indiscriminate: the previous apogamy has been converted into homogamy, with the usual result of causing a divergence of type. Darwin, and After Darwin (Vol 3 of 3) Post-Darwinian Questions: Isolation and Physiological Selection 2011-10-18T02:00:18.363Z
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