Telolecithal - Wikipedia
Telolecithal (Greek: τέλος (telos) = end, λέκιθος (lekithos) = yolk), refers to the uneven distribution of yolk in the cytoplasm of ova found in birds, reptiles, fish, and monotremes. The yolk is concentrated at one pole of the egg, separate from the developing embryo.
Telolecithal yolk | embryology | Britannica
In yolk. …of the egg are termed telolecithal. This occurs in many invertebrates and in all vertebrates lower than marsupial mammals. In arthropods, the yolk is massed near the centre of the egg; such eggs are termed centrolecithal. Read More.
DEVELOPMENTAL BIOLOGY 3230 - University of Utah
Telolecithal eggs are characteristic of birds, fishes, and reptiles while centrolecithal eggs are characteristic of insects. Telolecithal eggs result in meroblastic discoidal cleavage. Cleavage is restricted to the blastodisc at the animal pole of the egg.
Telolecithal Definition & Meaning | Merriam-Webster Medical
The meaning of TELOLECITHAL is having the yolk large in amount and concentrated at one pole.
What is the Difference Between Holoblastic and Meroblastic Cleavage
2019年2月15日 · Holoblastic cleavage refers to the complete division of an isolecithal or mesolecithal egg into blastomeres while meroblastic cleavage refers to the incomplete cleavage in telolecithal or centrolecithal eggs resulting in unequal blastomeres.
Egg Cell: Structure, Types, Functions and Oogenesis - Microbe Notes
2024年3月27日 · Telolecithal eggs have most of their yolk near the vegetal pole, with the cytoplasm and nucleus situated near the animal pole. This distribution is observed in mesolecithal and macrolecithal eggs.
How Amount and Distribution of Yolk Affect Cleavage
Telolecithal eggs of reptiles, birds, and most fish divide by discoidal cleavage. Because of the great mass of yolk in these eggs, cleavage is confined to a small disc of cytoplasm lying atop a mound of yolk (see chick development in Figure 8-7D).
Early Development in Birds - Developmental Biology - NCBI …
Fertilization of the chick egg occurs in the oviduct, before the albumen and the shell are secreted upon it. The egg is telolecithal (like that of the fish), with a small disc of cytoplasm sitting atop a large yolk. Like fish eggs, the yolky eggs of birds undergo discoidal meroblastic cleavage.
Telolecithal - Wikiwand
Telolecithal (Greek: τέλος (telos) = end, λέκιθος (lekithos) = yolk), refers to the uneven distribution of yolk in the cytoplasm of ova found in birds, reptiles, fish, and monotremes. The yolk is concentrated at one pole of the egg, separate from the developing embryo.
Telolecithal - Oxford Reference
An egg in which the yolk occurs at one end of the cytoplasm, giving rise to a vegetal pole. Mesolecithal and macrolecithal eggs are also telolecithal. Compare isolecithal.