Sentences with phrase «viable offspring when»

A working definition of a species is that members of the same species can produce viable offspring when they mate — something members of different species can not do unless the species are very closely related.

Other workers have failed to produce viable offspring when they attempted equivalent experiments.

Not exact matches

The 13 sheep in the new study were created from 2005 to 2007, when biologist Keith Campbell, a key member of the Dolly team, was trying to improve cloning — creating more viable embryos to implant in the wombs of surrogate mothers, more pregnancies, and more live offspring.