Cov txheej txheem:
- qhov chaw tshwj xeeb recombination tshwm sim nyob qhov twg?
- Yuav ua li cas thiaj rov sib tau?
- Qhov twg hauv qab no yog qhov chaw tshwj xeeb recombination?
- Yuav ua li cas recombination yuav tshwm sim?
Video: Qhov chaw ntawm kev sib koom ua ke feem ntau tshwm sim yog dab tsi?
2024 Tus sau: Fiona Howard | [email protected]. Kawg hloov kho: 2024-01-10 06:38
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.
Pom zoo:
Dab tsi yog bayeux tapestry dab tsi yog qhov cuam tshuam ntawm qhov kev tshwm sim nws ua kev nco txog?
Kristine Tanton. Ntsuas nees nkaum ntiv tes siab thiab yuav luag 230 ko taw ntev, Bayeux Tapestry ua kev nco txog kev tawm tsam rau lub zwm txwv ntawm Askiv ntawm William, Duke of Normandy, thiab Harold, Earl ntawm Wessex(Normandy yog ib cheeb tsam nyob rau sab qaum teb Fabkis).
Puas muaj qhov sib txawv ntawm qhov tshwm sim thiab qhov tshwm sim?
Raws li lub npe qhov txawv ntawm qhov tshwm sim thiab qhov tshwm sim. yog happenchance is a coincidental happen while happenstance is (countable) a chance or random event or random events . Puas muaj lo lus tshwm sim? : a xwm txheej tshwj xeeb yog vim muaj caij nyoog Lawv tuaj ua ke los ntawm qhov tshwm sim .
Vim li cas kev sib tsoo feem ntau tshwm sim ntawm kev sib tshuam?
Kev sib tsoo feem ntau tshwm sim ntawm kev sib tshuam vim cov no yog qhov chaw uas ob lossis ntau txoj kev hla ib leeg thiab kev ua ub no xws li tig sab laug, hla dhau, thiab tig sab xis muaj peev xwm ua rau muaj kev tsis sib haum xeeb . Pob tsheb sib tsoo feem ntau tshwm sim ntawm kev sib tshuam?
Nyob rau hauv ib qho kev tsis sib haum xeeb pn kev sib tshuam cov kev sib tshuam tam sim no ntawm qhov sib npaug yog?
Nyob rau hauv qhov tsis ncaj ncees PN-kho qhov kev sib tshuam tam sim no ntawm qhov sib npaug yog zero, vim tias sib npaug tab sis cov neeg nqa khoom hla hla kev sib tshuam . Thaum pn kev sib tshuam tsis ncaj ncees qhov kev sib tshuam tam sim no ntawm qhov sib npaug yog?
Nyob rau hauv qhov tshwm sim yog dab tsi yog kev sib koom ua ke?
Yog tias ob qhov xwm txheej tsis muaj qhov sib koom ua ke (Lawv kev sib tshuam yog qhov khoob.), cov xwm txheej raug hu ua kev sib koom ua ke. Yog li, P(A∩B)=0. Qhov no txhais tau tias qhov tshwm sim ntawm qhov tshwm sim A thiab qhov tshwm sim B tshwm sim yog xoom .
