unequal cleavage

unequal cleavage
division of the zygote in which the blastomeres about the vegetal pole remain larger than those nearer the animal pole.

Medical dictionary. 2011.

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  • 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

  • cleavage — 1. Series of mitotic cell divisions occurring in the ovum immediately following its fertilization. SYN: segmentation (2). SEE ALSO: c. division. 2. Splitting of a complex molecule into two or more simpler molecules. SYN: scission (2). 3 …   Medical dictionary

  • Egg cleavage — Segmentation Seg men*ta tion, n. The act or process of dividing into segments; specifically (Biol.), a self division into segments as a result of growth; cell cleavage; cell multiplication; endogenous cell formation. [1913 Webster] {Segmentation… …   The Collaborative International Dictionary of English

  • holoblastic cleavage — division of the zygote in which the entire cell participates in division; subclassified as equal or unequal depending on whether the resulting blastomeres are all of the same size. Called also complete or total c …   Medical dictionary

  • macromere — A blastomere of large size, as in amphibians. [macro + G. meros, part] * * * mac·ro·mere mak rō .mi(ə)r n any of the large blastomeres that occur in the hemisphere of a telolecithal egg containing the vegetal pole and that are formed by unequal… …   Medical dictionary

  • micromere — A blastomere of small size; for example, one of the blastomeres at the animal pole of an amphibian egg. [micro + G. meros, a part] * * * mi·cro·mere mī krō .mi(ə)r n one of the smaller blastomeres resulting from the unequal segmentation of an egg …   Medical dictionary

  • amphiblastic — am·phi·blas·tic .am(p) fə blas tik adj characterized by complete but unequal segmentation used of telolecithal eggs * * * am·phi·blas·tic (am″fe blasґtik) [amphi + blast + ic] denoting the complete but unequal cleavage of a telolecithal egg …   Medical dictionary

  • amphimorula — am·phi·mor·u·la (am″fĭ morґu lə) [amphi + morula] the morula resulting from unequal cleavage, the cells of the two hemispheres being of unequal size …   Medical dictionary

  • macromere — /mak reuh mear /, n. Embryol. one of the large blastomeres that form toward the vegetal pole in embryos undergoing unequal cleavage. [1875 80; MACRO + MERE] * * * …   Universalium

  • micromere — /muy kreuh mear /, n. a small blastomere, as one of those that form toward the animal pole in embryos that undergo unequal cleavage or those that occur in the embryo of mammals. [1875 80; MICRO + MERE] * * * …   Universalium

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