Recombination tshwm sim thaum ob lub molecules ntawm DNA pauv daim ntawm lawv cov khoom siv caj ces nrog ib leeg. Ib qho piv txwv tseem ceeb tshaj plaws ntawm kev sib koom ua ke tshwm sim thaum lub sij hawm meiosis(tshwj xeeb, thaum lub sij hawm prophase I), thaum homologous chromosomes kab nyob rau hauv khub thiab sib pauv ntu ntawm DNA.
qhov chaw tshwj xeeb recombination tshwm sim nyob qhov twg?
Qhov chaw tshwj xeeb recombination yog kev sib pauv uas tshwm sim nruab nrab ntawm ob khub ntawm cov kab ke teev tseg (cov phiaj xwm phiaj xwm) nyob ntawm tib DNA molecule lossis ntawm ob qhov sib txawv DNA molecules. Qhov tshwm sim ntawm kev sib pauv yuav yog kev sib koom ua ke, kev txiav tawm, lossis kev hloov pauv ntawm DNA ib ntus.
Yuav ua li cas thiaj rov sib tau?
Nyob rau hauv eukaryotic hlwb, uas yog cov hlwb nrog ib tug nucleus thiab organelles, recombination feem ntau tshwm sim thaum meiosis Meiosis yog ib hom cell division uas tsim gametes, los yog qe thiab phev hlwb. Thaum thawj theem ntawm meiosis, homologous khub ntawm niam thiab txiv chromosomes sib haum.
Qhov twg hauv qab no yog qhov chaw tshwj xeeb recombination?
Qhov twg hauv qab no yog qhov yuav tsum tau rau qhov chaw tshwj xeeb recombination cov tshuaj tiv thaiv? Nqe lus piav qhia: Recombinase yog tetrameric protein uas khi rau ob lub chromosomes uas dhau los ntawm qhov chaw tshwj xeeb recombination cov tshuaj tiv thaiv. Nws yog ib qho yuav tsum tau rau cov tshuaj tiv thaiv.
Yuav ua li cas recombination yuav tshwm sim?
Recombination tshwm sim nyob rau hauv qhov xwm txheej raws li qhov xwm txheej ib txwm tshwm sim ntawm meiosis thiab tau txhim kho los ntawm qhov tshwm sim ntawm kev hla dhau, uas cov noob caj ces hu ua pawg sib txuas tau cuam tshuam, ua rau muaj kev sib pauv. ntawm ntu ntawm khub chromosomes uas tab tom sib cais.
