= yolk cleavage n.
单词 | θ18768 |
释义 | the world > life > biology > biological processes > procreation or reproduction > conception > [noun] > synapsis or yolk-division (4) yolk division1852 = yolk cleavage n. yolk cleavage1853 division of the ooplasm or yolk (sense 1c), esp. as the initial process in the development of the embryo. yolk segmentation1857 = yolk cleavage n. synapsis1895 Biology. Originally in sense of quots. 1895 1905; in modern use, chromosomal pairing during the zygotene stage of meiosis. |
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