first-generation

Compared with virginoparae, the genetic relationship between fundatrix and the first generation of virginoparae (apterous) produced by fundatrix (apterous) was much close.

③干母和干雌的遗传关系很近,但孤雌蚜已与二者有分化.

In micrographics, a measure of the remoteness of the copy from the original material, the first microfilm representation being the first generation microfilm.

在缩微照技术中，度量副本离原始资料远近的程度。次缩微后的胶片为缩微胶片。