spiral cleavage

spiral cleavage
noun Date: 1892 holoblastic cleavage that is typical of protostomes and that is characterized by arrangement of the blastomeres of each upper tier over the cell junctions of the next lower tier so that the blastomeres spiral around the pole to pole axis of the embryo — compare radial cleavage

New Collegiate Dictionary. 2001.

Look at other dictionaries:

  • spiral cleavage — spiral cleavage. См. спиральное дробление. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

  • spiral cleavage — A type of early embryonic cleavage in which, after the first few divisions, the cells of the upper quartet in the eight celled stage lie above and between the cells of the lower quartet and thus tend to form a spiral pattern …   Dictionary of invertebrate zoology

  • spiral cleavage — Pattern of early cleavage found in molluscs and annelids (both mosaic eggs). The animal pole blastomeres are rotated with respect to those of the vegetal pole. The handedness of the spiral twist shows maternal inheritance …   Dictionary of molecular biology

  • spiral cleavage — a cleavage pattern characteristic of such invertebrates as annelids and mollusks, in which the cleavage planes are oriented obliquely to the polar axis of the zygote …   Medical dictionary

  • Cleavage (embryo) — In embryology, cleavage is the division of cells in the early embryo. The zygotes of many species undergo rapid cell cycles with no significant growth, producing a cluster of cells the same size as the original zygote. The different cells derived …   Wikipedia

  • Spiral (disambiguation) — A spiral is a curve which emanates from a central point, getting progressively farther away as it revolves around the point.Spiral may also refer to:cience and mathematics* Spiral galaxy, a type of galaxy in astronomy * Spiral dynamics, a theory… …   Wikipedia

  • cleavage — The early divisions of the fertilized egg to form blastomeres. The cleavage pattern is radial in some phyla, spiral in others …   Dictionary of molecular biology

  • radial cleavage — noun Date: 1973 holoblastic cleavage that is typical of deuterostomes and that is characterized by arrangement of the blastomeres of each upper tier directly over those of the next lower tier resulting in radial symmetry around the pole to pole… …   New Collegiate Dictionary

  • alternating cleavage — see spiral cleavage …   Dictionary of invertebrate zoology

  • спиральное дробление — spiral cleavage спиральное дробление. Форма дробления, заключающаяся в двунаправленном делении зиготы при наличии определенного угла закручивания образующегося “креста”, причем его направление генетически детерминировано; С.д. известно у… …   Молекулярная биология и генетика. Толковый словарь.

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