Many scientists agree that the domestic dog displays more morphological variation than any other known species, thanks to selective breeding by humans.
许多科学家都认为，国内的狗更显示形态比任何其他已知的物种变异，人类有选择育种的感谢。
Eugenics: the study of hereditary improvement of the human race by controlled selective breeding.
优生学：通过可控制选择性生育来对人种进行遗传学上的改善的研究。
The high-yield and high-quality in erect panicle type Japonica line could be selected by anther culture or group selective breeding.
通过花培和组群筛选法均能较快地获得直穗型高产优质粳稻品系。
By the experiment of genetics stability, it showed that genetic variation of the strain had already taken place. It was the highest strain of the tylosin of selective breeding after space mutagenesis.
结合菌株传代稳定性试验，说明该菌株已发生了遗传性变异，是经太空诱变后所选育的泰乐菌素高产菌株。
By the experiment of genetics stability, it showed that genetic variation of the strain had already taken place. It was the highest strain of the tylosin of selective breeding after space mutagenesis.
结合菌株传代稳定性试验，说明该菌株已发生了遗传性变异，是经太空诱变后所选育的泰乐菌素高产菌株。
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