Advancements in reproductive assurance and delayed selfing .

繁殖保障和延迟自交的研究进展。

Homozygous races do not segregate on selfing .

自体受精不能分离纯合的生理小种。

However , the growth rate of pollen tubes is faster in the crossing combination than selfing .

花粉管生长速度则以杂交组合快於自交组合。

They produce no offspring of their own , one consequence of which is that populations of plants and animals capable of self-fertilisation , or " selfing " , grow at twice the rate of populations that depend on sexual reproduction .

他们不会繁衍自己的后代，一个后果就是，能够自体受精的动植物数量的增长率，是依赖有性生殖的两倍。