caenogenesis是什么意思？

caenogenesis

英['si:nə'dʒenɪsɪs] 美[ˌsɪnə'dʒenəsɪs]

• n. 新性发生；

英英词典释义

• Noun
  1. introduction during embryonic development of characters or structure not present in the earlier evolutionary history of the strain or species (as addition of the placenta in mammalian evolution)