facultative

Example Sentences

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Some require fertilization to produce seeds, while others can also reproduce without fertilization, a process known as facultative agamospermy.

From Science Daily • Dec. 20, 2025

For the first time, scientists have induced facultative parthenogenesis, a form of asexual reproduction, in an animal that usually reproduces sexually.

From Salon • Jul. 28, 2023

Some species, termed facultative parthenogens, alternate between sexual and asexual reproduction.

From Scientific American • Jun. 9, 2023

Note that there is no clear line that differentiates facultative carnivores from omnivores; dogs would be considered facultative carnivores.

From Textbooks • Jun. 9, 2022

We have seen that the deliberate restraint of conception has become a part of our civilized morality, and that the practice and theory of facultative abortion has gained a footing among us.

From Studies in the Psychology of Sex, Volume 6 Sex in Relation to Society by Ellis, Havelock