只要沒有受精，無精蛋就類似母雞的月經+排卵。
魚是體外受精的動物，一條煎魚體內如果有很多魚蛋，那些蛋就都是無精蛋。
植物種子是受精之後才會結成的繁殖結構，比如每一粒玉米都是受精之後等待發芽的種子。
#普通科學小知識
#生物學
#自然科學
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