この植物は自家受精によって種子を作る。
This plant produces seeds by self-fertilization.
自家受精は他家受精に比べて遺伝的多様性が低い。
Self-fertilization results in lower genetic diversity compared to cross-fertilization.
他家受精 means cross-fertilization (between different individuals), the opposite of 自家受精.
Compound of 自家 (self, one's own) and 受精 (fertilization). The exact historical derivation is uncertain, but the term is a modern scientific coinage.