preformation (ˌpriːfɔːˈmeɪʃən) ![]() | |
| —n | |
| 1. | the act of forming in advance; previous formation |
| 2. | biology Compare epigenesis the theory, now discredited, that an individual develops by simple enlargement of a fully differentiated egg cell |
| a group of individuals or species having a common ancestry |
| adapting to the prevailing conditions and producing offspring that survive to reproductive age; contributing to the gene pool of the next generation |