| 单词 |
haplont |
| 释义 |
haplont Biol.|ˈhæplɒnt|
[a. G. haplont, f. haplo- + Gr. ὤν, ὀντ- being: see onto-.]
A sexual organism that is haploid at all stages of its life other than the zygote, which is diploid; an organism at a stage, or during the stages, in its life cycle at which it is haploid. So haˈplontic a., characteristic of, or having the characteristics of, a haplont.
1920Bot. Abstr. V. 214 (heading) Biology and morphology of the male haplonts of some Oenotheras. 1925E. B. Wilson Cell (ed. 3) vi. 492 The spores..receive the haploid number of chromosomes and develop without fertilization into a haploid, gamete-producing ‘sexual’ generation, known as the haplont (in plants the gametophyte) which intervenes between meiosis and the gamete-formation. 1929Hereditas XIII. 311, I propose the terms haplontic and diplontic sterility. 1938Bot. Rev. IV. 135 It is more probable that the above-described diplohaplontic Ulvaceae and Cladophoraceae arose from a haplontic ancestor than from a primitive ancestral type with alternating unicellular haploid and diploid phases. 1951M. O. P. Iyengar in G. M. Smith Man. Phycol. iii. 59 Protosiphon is another member of the Siphonales which is a haplont and not a diplont like the majority of the Siphonales. 1964Priestley & Scott Introd. Bot. (ed. 4) xxxiii. 499 If this is confirmed the nuclei in the Vaucheria thallus would be haploid and the life-cycle haplontic with the zygote (and zygospore) the only cell representing the diploid stage. |
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