30개의 결과 중 1 - 5개
Distinction betwecn,tho sterility of first crosses and of hybrids— Sterility various in
degree, not universal, affected by close interbreeding, removed by domestication
— Laws governing tho sterility of hybrids— Sterility not a special endowment, ...
Sterility has been said to be the bane of horticulture ; but on this view we owe
variability to the same cause which produces sterility ; and variability is the
source of all the choicest productions of the garden. I may add, that as some
Some authors believe that long-continued domestication eliminates this strong
tendency to sterility : from the history of the dog I think there is some probability in
this hypothesis if applied to species closely related together, though it is ...
... &c, the importance of the crossing both of distinct species and of varieties is
immense ; for the cultivator here quite disregards the extreme variability both of
hybrids and mongrels, and the frequent sterility of hybrids ; but the cases of plants
... sterility of first crosses 216 [Coap. VII, INSTINCT.
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