Hybrids

例句:

• The variability, however, in the successive generations of mongrels is, perhaps, greater than in hybrids. 查尔斯·达尔文. 物种起源.
• Many exotic plants have pollen utterly worthless, in the same condition as in the most sterile hybrids. 查尔斯·达尔文. 物种起源.
• We see this tendency to become striped most strongly displayed in hybrids from between several of the most distinct species. 查尔斯·达尔文. 物种起源.
• The above view of the sterility of hybrids being caused by two constitutions being compounded into one has been strongly maintained by Max Wichura. 查尔斯·达尔文. 物种起源.
• In regard to the sterility of hybrids, in which the sexual elements are imperfectly developed, the case is somewhat different. 查尔斯·达尔文. 物种起源.
• Altogether there is the closest identity in character and behaviour between illegitimate plants and hybrids. 查尔斯·达尔文. 物种起源.
• This greater variability in mongrels than in hybrids does not seem at all surprising. 查尔斯·达尔文. 物种起源.
• So it is with hybrids, for their offspring in successive generations are eminently liable to vary, as every experimentalist has observed. 查尔斯·达尔文. 物种起源.
• The fertility, both of first crosses and of hybrids, is more easily affected by unfavourable conditions, than is that of pure species. 查尔斯·达尔文. 物种起源.
• We will now look a little closer at the probable nature of the differences between species which induce sterility in first crosses and in hybrids. 查尔斯·达尔文. 物种起源.
• It is not always equal in degree in a first cross and in the hybrids produced from this cross. 查尔斯·达尔文. 物种起源.
• From this extreme degree of sterility we have self-fertilised hybrids producing a greater and greater number of seeds up to perfect fertility. 查尔斯·达尔文. 物种起源.
• Quatrefages states that the hybrids from two moths (Bombyx cynthia and arrindia) were proved in Paris to be fertile inter se for eight generations. 查尔斯·达尔文. 物种起源.
• Why, it may even be asked, has the production of hybrids been permitted? 查尔斯·达尔文. 物种起源.
• With hybrids raised from the same seed-capsule the degree of sterility is innately variable, so it is in a marked manner with illegitimate plants. 查尔斯·达尔文. 物种起源.
• We will now consider a little more in detail the laws governing the sterility of first crosses and of hybrids. 查尔斯·达尔文. 物种起源.
• The hybrids, moreover, produced from reciprocal crosses often differ in fertility. 查尔斯·达尔文. 物种起源.
• Between the sterility thus superinduced and that of hybrids, there are many points of similarity. 查尔斯·达尔文. 物种起源.
• Now the fertility of first crosses, and of the hybrids produced from them, is largely governed by their systematic affinity. 查尔斯·达尔文. 物种起源.
• And in this case, it is not at all surprising that the inherent sterility in the hybrids should have gone on increasing. 查尔斯·达尔文. 物种起源.
• First crosses between forms, sufficiently distinct to be ranked as species, and their hybrids, are very generally, but not universally, sterile. 查尔斯·达尔文. 物种起源.
• Both hybrids and mongrels can be reduced to either pure parent form, by repeated crosses in successive generations with either parent. 查尔斯·达尔文. 物种起源.
• Now, hardly any cases have been ascertained with certainty of hybrids from two quite distinct species of animals being perfectly fertile. 查尔斯·达尔文. 物种起源.
• He who will explain these latter cases will be able to explain the sterility of hybrids. 查尔斯·达尔文. 物种起源.

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