metagenesis

/met-uh-jen-uh-sis/US // ˌmɛt əˈdʒɛn ə sɪs //UK // (ˌmɛtəˈdʒɛnɪsɪs) //

遗传基因,遗传学,诱发机制,玄学

Definitions

n.名词 noun

1
Biology.
- : reproduction characterized by the alternation of a sexual generation and a generation that reproduces asexually; alternation of generations.

There are some species which, having no hydroid or strobila state, mature without alternation of generation (metagenesis).
The former would thus nearly coincide with Haeckels progressive, and the latter with his retrogressive metagenesis.
We are therefore able to distinguish this primary metagenesis from the secondary metagenesis arising from metamorphosis.
The term Nurse (German Amme), employed for the asexual generations in metagenesis, may advantageously be dropped altogether.
In Trachylinae also the beginnings of a similar metagenesis can be found.