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2024 Tus sau: Michael Samuels | [email protected]. Kawg hloov kho: 2023-12-16 01:44
Cov txheej txheem ntawm kev tsim khoom qe nyob rau hauv lub zes qe menyuam yog hu ua oogenesis. A qe loj cov ntaub ntawv tsuas yog tias qib oocyte thib ob yog fertilized los ntawm cov phev. Oogenesis pib ntev ua ntej yug menyuam thaum oogonium nrog tus lej diploid ntawm chromosomes hla mitosis. Nws ua rau tus ntxhais diploid ntawm tes hu ua thawj oocyte.
Hais txog qhov no, dab tsi yog cov qe qe loj hlob hu ua?
Gametes yog lub cev ua me nyuam hlwb . Lawv kuj raug hu ua poj niam txiv neej hlwb . Poj niam gametes yog hu ua ova lub qe qe , thiab txiv neej gametes yog hu ua phev. Cov ov paub tab hauv zes qe menyuam ntawm poj niam, thiab cov phev loj hlob hauv cov noob qes.
Ib qho ntxiv, puas yog txheej txheem uas cov qe qe tsim? Cov ntsiab lus: Thaum kawg ntawm meiosis, 4 tus ntxhais cov hlwb raug tsim = qe los yog phev. Txhua tus muaj ib nrab ntawm ntau cov chromosomes raws li niam txiv ntawm tes (n); txhua ntawm tes yog kev sib txawv ntawm nws niam nws txiv thiab los ntawm nws "cov nus muag". Fertilization ntawm ib qe los ntawm cov phev rov ua tus lej chromosome rau 2n.
Yog li ntawd, lo lus twg piav qhia txog kev tso tawm ntawm lub qe loj los ntawm zes qe menyuam?
Ovulation, tso tawm ntawm lub qe paub tab los ntawm tus poj niam zes qe menyuam ; cov tso tawm enables cov qe yuav tsum tau fertilized los ntawm cov txiv neej phev hlwb. Feem ntau, hauv tib neeg, tsuas yog ib qho xwb qe yog tso tawm nyob rau hauv ib lub sij hawm; Qee lub sij hawm, ob los yog ntau tshaj erupt thaum lub sij hawm cev xeeb tub.
Lub luag haujlwm ntawm qe qe yog dab tsi?
Cov muaj nuj nqi ntawm ovum yog nqa cov txheej txheem chromosomes los ntawm tus poj niam thiab tsim qhov chaw ib puag ncig kom muaj peev xwm ua kom fertilization los ntawm cov phev. Ova tseem muab cov as -ham rau kev loj hlob embryo kom txog thaum nws nkag mus rau hauv lub tsev menyuam thiab qhov tso menyuam tawm.
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