Video: Vim li cas DNA pov thawj tseem ceeb heev?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
DNA pov thawj yog ib qho cuab yeej siv tau thiab nruab nrab hauv kev tshawb nrhiav kev ncaj ncees. Txawm hais tias nws pab txiav txim siab lossis tshem tawm cov tib neeg, DNA pov thawj yuav ua si nce tseem ceeb lub luag hauj lwm hauv kev daws teeb meem txhaum cai yav tom ntej. Qhov tshwm sim yuav muaj kev ncaj ncees zoo dua rau cov neeg raug tsim txom thiab cov zej zog nyab xeeb.
Tom qab ntawd, cov pov thawj DNA ntseeg tau li cas?
Cov cim siv ntau dua, qhov tseeb ntau dua, tab sis kuj yog tus nqi ntawm kev sim. Qhov tshwm sim ntawm cov DNA profiles ntawm ob tus neeg tsis sib xws yog qhov nruab nrab tsawg dua 1 ntawm 1 billion. Ib qho piv txwv tuaj yeem yog los ntawm ib feem ntawm lub cev, txij li lub DNA yog tib yam.
Qhov thib ob, qhov teeb meem nrog DNA pov thawj yog dab tsi? Qhov teeb meem nrog DNA . Forensic pov thawj nce ntxiv suav nrog kev tshuaj ntsuam genetic fingerprinting, tab sis cov kws tshawb fawb txhawj xeeb tias cov neeg txiav txim siab yuav muab cov khoom lag luam ntau dhau rau hauv cov txiaj ntsig. Txij li thaum lub advent ntawm Kev kuaj DNA , nws tau daws cov teeb meem txias, kev sib txuas ua txhaum cai ua txhaum cai nyob rau hauv ntau txoj cai lij choj thiab txawm tso cov txiv neej dawb huv los ntawm kab tuag.
Kuj kom paub, dab tsi yog cov pov thawj DNA siv rau feem ntau?
Siv Cov Qauv Los Ntawm Cov Neeg Paub Tus feem ntau Cov qauv siv los ntawm cov neeg paub yog cov ntshav, qhov ncauj / qhov ncauj qhov ntswg, thiab / lossis plucked plaub hau (piv txwv li, taub hau, pubic).
DNA pov thawj ntev npaum li cas?
Kawg xyoo, cov kws tshawb fawb kwv yees tias ib nrab-lub neej ntawm DNA - lub ntsiab lus nyob rau hauv uas ib nrab ntawm daim ntawv cog lus nyob rau hauv a DNA Cov pob txha molecule yuav tawg - yog 521 xyoo. Qhov ntawd txhais tau tias, nyob rau hauv cov xwm txheej zoo tagnrho, DNA yuav kawg kwv yees li 6.8 lab xyoo, tom qab ntawd tag nrho cov ntawv cog lus yuav tawg.
Pom zoo:
Koj ua pov thawj li cas cov kab yog sib npaug hauv cov ntawv pov thawj?
Thawj yog yog tias cov ces kaum sib thooj, cov ces kaum uas nyob rau tib lub ces kaum ntawm txhua qhov kev sib tshuam, sib npaug, ces cov kab sib npaug. Qhov thib ob yog yog tias qhov sib txawv sab hauv lub kaum sab xis, cov ces kaum uas nyob rau sab nraud ntawm lub transversal thiab sab hauv cov kab sib npaug, sib npaug, ces cov kab sib npaug
Vim li cas qhov tseem ceeb ntawm qhov tseem ceeb?
Thaum koj pom tus nqi kiag li hauv qhov teeb meem lossis qhov sib npaug, nws txhais tau hais tias txhua yam nyob hauv tus nqi tiag tiag yog qhov zoo. Cov txiaj ntsig tsis zoo feem ntau siv rau hauv cov teeb meem cuam tshuam nrog kev nyob deb thiab qee zaum siv nrog qhov tsis sib xws. Qhov ntawd yog qhov tseem ceeb uas yuav tsum nco ntsoov nws zoo li qhov deb ntawm xoom
Dab tsi pov thawj siv cov duab ntawm lub dav hlau sib koom ua pov thawj cov khoom geometric?
Cov ntaub ntawv pov thawj uas siv cov duab ntawm lub dav hlau sib koom ua pov thawj geometric zog yog hu ua trigonometric
Vim li cas DNA thiaj li tseem ceeb heev?
DNA yog cov txheej txheem tseem ceeb heev vim tias yog DNA tsis tau rov ua dua, ces thaum lub hlwb sib faib, yuav tsis muaj qhov tseeb ntawm DNA nyob hauv txhua lub cell. Qhov no yuav ua rau muaj teeb meem ntau hauv tib neeg lub cev. Txuas koj txoj kev xav: Qee zaum yuam kev hu ua kev hloov pauv tshwm sim thaum lub sijhawm DNA rov ua dua
Yuav ua li cas yog vim li cas tus qauv ntawm ib qho enzyme tseem ceeb heev rau nws txoj haujlwm hauv cov khoom muaj sia?
Enzymes ua kom cov tshuaj tiv thaiv uas tshwm sim hauv cov hlwb. Qhov kev ua haujlwm no cuam tshuam ncaj qha rau lawv cov qauv, nrog rau txhua qhov enzyme tau tshwj xeeb zoo li tus ua kom muaj zog rau ib qho tshuaj tiv thaiv. Kev poob ntawm cov qauv ua rau poob haujlwm. - Kub, pH, thiab kev tswj cov molecules tuaj yeem cuam tshuam rau kev ua haujlwm ntawm cov enzymes