Tom qab ovulation lub oocyte raug ntes nyob rau hauv metaphase ntawm meiosis II mus txog fertilization. Thaum fertilization, tus thib ob oocyte ua tiav meiosis II los ua ib tug laus oocyte (23, 1N) thiab ib tug thib ob polar lub cev.
Thaum twg thiab qhov twg oocyte ua tiav meiosis 2 yuav tshwm sim li cas thaum nws ua tiav meiosis 2?
Kev ua tiav ntawm Meiosis ntawm fertilization
-Yog tias fertilization tshwm sim, qhov thib ob oocyte yuav ua tiav meiosis II mus rau ua ib lub qe loj (tag nrho mature) thiab lub polar thib ob lub cev uas tau degenerated. SRY protein yuav txhawb txoj kev loj hlob ntawm qog nqaij hlav.
Dab tsi ua rau meiosis II hauv oocyte?
Tham qhov kev ntes yog vim tsis muaj cov kab mob ntawm tes txaus kom tso cai rau kev loj hlob meiotic. Txawm li cas los xij, raws li oocyte loj hlob, cov proteins no tau tsim, thiab meiotic raug ntes tau nyob ntawm cyclic AMP. … Kev tshem tawm ntawm oocyte los ntawm cov hauv paus hniav ua rau meiosis mus rau hauv oocyte.
Pob oocyte theem nrab ua tiav?
Hauv tib neeg, cov oocytes thib ob yog tsim thaum thawj oocytes ua tiav meiosis I. … Yog li, thaum cov phev cell fertilizes poj niam txiv neej cell lub oocyte thib ob oocyte sai sai ua tiav cov seem ntawm meiosis II, ua rau ib tug ootid thiab ovum, uas cov phev cell koom nrog.
Dab tsi ua rau oocyte theem nrab ua kom tiav meiosis II?
Tus thib ob oocyte ua tiav meiosis IItsuas yog thaum fertilized los ntawm spermatozoan. Tom qab pib fertilization, lub thib ob oocyte pib nws thib ob meiotic division, uas ua rau tsim ib tug paub tab ovum thiab lwm lub cev polar. Lub sijhawm no, lub zes qe menyuam tau npaj fuse nrog cov spermatozoan.
