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Definition
| Describes an egg that contains dense yolk concentrated in the center. |
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Definition
| During embryogenesis, a rapid series of mitotic divisions of the zygote to form smaller cells. |
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Definition
| The elongation of a cell layer in one dimension and shortening in another dimension. |
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Definition
| Division of the cytoplasm during cell division. |
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Definition
| The splitting of one cellular sheet into two parallel sheets. |
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Definition
| Species in which the blastopore forms the anus, and mouth forms from a later opening on the other end of the archenteron. |
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Definition
| Meroblastic cleavage restricted to a small disc of cytoplasm at the animal pole. |
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Definition
| The movement of an epithelial sheet as a unit to enclose deeper layers of an embryo. |
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Definition
| During embryogenesis, the rearrangement of blastomeres to produce an embryo with 3 primary germ layers. |
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Definition
| Cleavage in which the furrow extends through the entire egg. |
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Definition
| The migration of individual cells from an epithelium into a cavity. |
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Term
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Definition
| The infolding of an epithelium into an interior space. |
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Term
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Definition
| The inward movement of an expanding outer layer so that it spreads over the internal surface. |
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Term
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Definition
| Describes an egg that contains sparse, evenly distributed yolk. |
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Term
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Definition
| Mitotic division of the nucleus. |
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Term
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Definition
| Cleavage in which only part of the cytoplasm is cleaved. |
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Term
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Definition
| Describes and egg that contains moderate yolk toward one end. |
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Term
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Definition
| In sea urchins, micromere-derived cells that are the first to ingress into the blastocoel and later differentiate into skeletal spicules. |
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Term
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Definition
| Meroblastic cleavage limited to a surface layer of cytoplasm at the periphery of the egg. |
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Term
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Definition
| Describes an egg that contains dense yolk at one end. |
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Term
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Definition
| Species in which the blastopore forms the mouth and the anus forms from a later opening into the embryo. |
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