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Any of numerous organisms, such as many fungi and protozoans, that are haploid except during the zygote stage.

[Greek haploos, single, simple; see haploid + -ont.]

hap·lon′tic adj.


(Biology) biology an organism, esp a plant, that has the haploid number of chromosomes in its somatic cells
haˈplontic adj


(ˈhæp lɒnt)

the haploid individual in a life cycle that has a diploid and a haploid phase.
[1915–20; hapl(oid) + -ont < Greek ont-, s. of ṓn being, present participle of eînai to be (compare onto-)]
References in periodicals archive ?
Since these advanced charophyceans are fundamentally gametophytic organisms, with simple, haplontic life cycles (and zygotic meiosis)--no sporophyte being present in their life cycles--we should strongly suspect that the sporophyte was developed (in very early land plants originating from charophyte-like predecessors) antithetically, as an addition to the life cycle (by mitosis of a zygote retained on the gametophyte) and in response to newly available terrestrial (at least amphibious) habitats.