facultative

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

"Fascinatingly, we found that the obligately agamospermous Balanophora species were all island species -- and we speculate that more Balanophora species may be facultative, or even obligate, agamosperms."

From Science Daily • Dec. 20, 2025

"Certain temperature conditions may foster all-female populations, which can be overcome through facultative parthenogenesis," he said.

From Salon • Jun. 10, 2023

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

From Scientific American • Jun. 9, 2023

Animals that exhibit facultative migration can choose to migrate or not.

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