Video: Dab tsi yog junk DNA thiab nws lub hom phiaj yog dab tsi?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Hauv cov noob caj noob ces, tus lub sij hawm DNA nkos hais txog thaj tsam ntawm DNA uas yog tsis-coding . Qee qhov no tsis muaj DNA yog siv los tsim noncoding RNA Cheebtsam xws li hloov RNA, tswj RNA thiab ribosomal RNA.
Yog li ntawd, dab tsi DNA hu ua junk?
Tsis-coding DNA sequences yog ib feem ntawm lub cev DNA uas tsis encode cov protein ntau. Thaum muaj ntau tsis-coding DNA , ib qho kev faib ua feem ntau zoo li tsis muaj kev ua haujlwm lom neeg, raws li kev kwv yees hauv xyoo 1960s. Txij thaum ntawd los, qhov tsis ua haujlwm no tau muaj teeb meem hu ua " DNA nkos ".
Ib yam li ntawd, vim li cas lo lus junk DNA yuam kev? Ntu ntawm DNA raws li ib tug chromosome uas tsis yog noob, tsis txhob code rau txhua yam uas peb paub, thiab nws lub hom phiaj peb tsis to taub. Cov lus junk tej zaum yuam kev Txawm li cas los xij, raws li qhov no DNA tej zaum yuav muaj lwm yam dej num, xws li tswj cov noob thaum lub sij hawm kev loj hlob.
Tib neeg kuj nug tias, peb muaj dab tsi DNA ntau npaum li cas?
Qhov seem ntawm peb cov genome - qhov chaw ntawm ib ncig ntawm 75 txog 90 feem pua ntawm peb DNA - yog qhov hu ua DNA nkos : tsis tas yuav muaj teeb meem los yog tshuaj lom kab mob, tab sis tsis muaj txiaj ntsig, garbled nucleotide sequences uas tsis ua hauj lwm nyob rau hauv cov nqe lus ntawm encoding proteins uas spur tag nrho cov tseem ceeb tshuaj tiv thaiv tawm mus rau hauv peb.
Puas yog junk DNA tib yam li introns?
Tsis yog. Lawv yog cov sib txawv, tab sis muaj kev sib tshooj - qee qhov DNA nkos suav nrog intros , thiab ntau intros tuaj yeem txiav txim siab DNA nkos.
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