Pallas maintained, and he has had some followers, that variability depends exclusively on the crossing of primordially distinct forms. [Please select]
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A large part of the {87} difference, no doubt, may be due to descent from primordially distinct species; but we may feel sure that there has been in addition a considerable amount of variation. [Please select]
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Youatt had proved his case, it might be argued that the sterility was wholly due to the two parent-breeds being descended from primordially distinct species. [Please select]
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