Zoological terms

Zoological terms

Terms in relation to animals, such as mammals, birds, reptiles or fish.

Industry: Zoology

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Zoological terms

Isolecithal

Zoology; Zoological terms

(little yolk equally distributed throughout cytoplasma) 1 st cleavage follows the primary axis, passing from animal to vegetal pole, producing a two-celled embryo; said to be total or holoblastic

Cilium

Zoology; Zoological terms

(pl. cilia, long eyelash) A short, centriole-based, hairlike organelle: Rows of cilia propel certain protista. Cilia also aid the movement of substances across epithelial surfaces of animal cells

The zygote undergoes a series of rapid, synchronous mitotic divisions; results in a ball of many cells. Pattern of cleavage is based on the amount of yolk. Eggs with a small yolk divide completely ...

Radial cleavage

Zoology; Zoological terms

(mostly resulting in deuterostomes , mouth comes second ); cleavage planes are alternately vertical and horizontal so that the cells are stacked in rows one upon another

Telolecithal

Zoology; Zoological terms

(yolk concentrated on the vegetal pole) undergoes total but unequal cleavage, the large mass of yolk remains undivided; therefore termed partial or meroblastic .

Centrolecithal

Zoology; Zoological terms

(yolk formed as a central mass) cytoplasma is concentrated in the periphery; cleavage takes place only in the outer shell, consequently typed as superficia