Vim tias txhua tus chromosome sib npaug muaj ob tus viv ncaus zoo tib yam chromatids koom nrog ntawm qhov chaw hu ua the centromere, cov qauv tam sim no tshwm sim li lub cev X-zoo li thaum saib hauv lub tshuab tsom. Ob peb DNA binding proteins catalyze cov txheej txheem condensation, suav nrog cohesin thiab condensin.
Lub npe ntawm cov qauv uas txuas ob chromatids yog dab tsi?
Tus muam chromatids yog khub ntawm cov ntawv luam zoo sib xws ntawm DNA koom nrog ntawm qhov chaw hu ua the centromere.
ob chromatids txuas qhov twg?
Tus muam chromatids zoo ib yam rau ib leeg thiab txuas rau ib leeg los ntawm cov protein hu ua cohesins. Kev sib txuas ntawm tus muam chromatids yog nruj tshaj plaws ntawm lub centromere, thaj tsam ntawm DNA uas yog qhov tseem ceeb rau lawv kev sib cais thaum lub sij hawm tom qab ntawm kev faib cell.
ob tug muam chromatids nyob qhov twg?
Thaum lub sijhawm DNA duplication nyob rau theem S, txhua tus chromosome tau rov ua dua los tsim ob daim ntawv tib yam, hu ua tus muam chromatids, uas tau tuav ua ke ntawm the centromere los ntawm cohesin proteins.
Dab tsi ua rau tus muam chromatids sib cais?
Metaphase ua rau anaphase, lub sijhawm uas txhua tus chromosome tus viv ncaus chromatids cais thiab txav mus rau cov ncej ntawm tes. Enzymatic tawg ntawm cohesin - uas txuas cov viv ncaus chromatids ua ke thaum lub sijhawm prophase - ua rau qhov kev sib cais no tshwm sim.
