(a.) Undergoing complete segmentation; composed entirely of germinal matter, the whole of the yolk undergoing fission; -- opposed to meroblastic.
Example Sentences:
(1) Phenotypically, the genus shows some similarity to Sympodiomyces because of the presence of a yeast morph with sympodial conidiogenous cell proliferation, but it is distinguished from that genus morphologically by a yeast morph with the enteroblastic-annellidic conidiogenesis and the conspicuous development of a hyphal morph with holoblastic-sympodial conidiogenous cells, and chemotaxonomically by the ubiquinone system Q-10 and 10% difference in the guanine plus cytosine (G + C) content of the nuclear DNA.
(2) The relative distinctions between holoblastic and enteroblastic development are discussed and it is concluded that the conidia should be referred to as blastoconidia.
(3) The large eggs of the marsupial frog Gastrotheca riobambae not only display an atypical holoblastic pattern of cleavage and a very slow rate of development, but the events of the midblastula transition are uncoupled, suggesting that amphibians may have a diversity of developmental patterns.
(4) Gastrulation in small regulating holoblastic eggs (e.g.
(5) E. werneckii cannot be accommodated in Cladosporium, a genus characterized by catenulate holoblastic coanidia.
(6) (i) the genera Microsporum, Trichophyton and Epidermophyton have holoblastic conidium-ontogeny; (ii) the investigated species exhibit polymeristematic development; (iii) delivery of the conidia occurs by means of a special detaching mechanism: consisting in autolysis of a detaching-cell or cells; (iv) the macroconidia have a primary septum; (v)chlamydospores including "gemmae" and "persistent-organs", strikingly similar to the macro- and microconidia as investigated in aqueous preparations, are also formed.
(7) Astropecten scoparius develops to a bipinnaria with simple ciliary bands and short bipinnari arms through a wrinkled blastula by holoblastic, radial cleavage.
(8) The problem on changes in assimilation of yolk by the vertebrate embryo at transition from holoblastic to meroblastic development is discussed from comparative point of view, as well as on nature of yolk entoderm in Amniota and Anamnia.
Meroblastic
Definition:
(a.) Consisting only in part of germinal matter; characterized by partial segmentation only; as, meroblastic ova, in which a portion of the yolk only undergoes fission; meroblastic segmentation; -- opposed to holoblastic.
Example Sentences:
(1) A hypothesis is put forward on pathways of changes of prospective importance of blastocoele in the vertebrate phylogenesis, in connection with their transition to meroblastic development.
(2) During meroblastic cleavage, and continuing in the early blastula, zebrafish blastomeres divide rapidly and synchronously.
(3) Cleavage (stages 1-10) is meroblastic and produces a typical teleost blastoderm.
(4) The problem on changes in assimilation of yolk by the vertebrate embryo at transition from holoblastic to meroblastic development is discussed from comparative point of view, as well as on nature of yolk entoderm in Amniota and Anamnia.
(5) The meroblastic egg of the teleost, Fundulus heteroclitus, was studied electrophysiologically from cleavage to mid-gastrula stages.
(6) Meroblast formation was effected by clefts originating from the parasite plasmalemma and by fusion of vacuoles with each other.