Video: Muaj pes tsawg tus tib neeg cov tawv nqaij sib faib txhua hnub?
2024 Tus sau: Michael Samuels | [email protected]. Kawg hloov kho: 2023-12-16 01:44
Ib txhia hlwb , zoo li cov tawv nqaij , yog tas li faib . Peb yuav tsum tsis tu ncua ua tshiab cov tawv nqaij los hloov lub cov tawv nqaij peb poob. Ua koj paub peb poob 30,000 rau 40,000 tuag cov tawv nqaij txhua feeb? Qhov ntawd txhais tau tias peb poob ib puag ncig 50 lab cell txhua hnub.
Tsis tas li ntawd, tib neeg cov tawv nqaij sib faib ntau npaum li cas?
Lub cev lub cev loj tshaj plaws Thaum twg koj tau txiav los yog khawb, daim tawv nqaij hlwb faib thiab multiply, hloov lub tawv nqaij koj tau ploj lawm. Txawm tsis raug mob, cov tawv nqaij niaj hnub tuag thiab poob. Koj poob 30,000 rau 40,000 tuag tawv nqaij hlwb txhua feeb, uas yog txog 50 lab hlwb txhua hnub.
Kuj Paub, puas yog tib neeg cov cell faib? Thaum nws tau theej tag nrho nws cov DNA, a ntawm tes ib txwm faib ua ob nov hlwb . Cov txheej txheem no hu ua mitosis. Txhua tus tshiab ntawm tes tau txais ib daim qauv ntawm tag nrho cov DNA, bundled li 46 chromosomes. Xovtooj uas ua qe los yog phev hlwb yuav tsum faib sib txawv.
Qhov thib ob, tib neeg cov tawv nqaij nyob hauv mitosis ntev npaum li cas?
Feem ntau, cov cell yuav siv sijhawm li 5 txog 6 teev kom tiav S theem. G2 luv dua, kav ntev xwb 3 mus rau 4 teev nyob rau hauv ntau lub hlwb. Nyob rau hauv tag nrho, ces, interphase feem ntau siv sijhawm ntawm 18 txog 20 teev. Mitosis, thaum lub xov tooj ntawm tes npaj rau thiab ua tiav kev faib cov cell tsuas yog siv txog 2 teev.
Nyob rau theem twg cov hlwb feem ntau siv feem ntau ntawm lawv lub neej?
interphase
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