Video: Thaum twg lawv pib siv cov pov thawj DNA?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Xyoo 1986 yog thaum DNA yog thawj zaug siv hauv kev tshawb nrhiav txhaum cai los ntawm Dr. Jeffreys. 1986. Kev tshawb nrhiav tau siv cov ntiv tes ntiv tes rau hauv ib rooj plaub ntawm ob qhov kev ua phem thiab tua neeg uas tau tshwm sim hauv xyoo 1983 thiab 1986.
Ua li no, thaum twg lawv pib siv DNA los daws kev ua txhaum cai?
Cov txheej txheem, tsim los ntawm Jeffreys ua ke nrog Peter Gill thiab Dave Werrett ntawm Forensic Science Service (FSS), yog thawj zaug siv forensically hauv daws ntawm kev tua ntawm ob tug hluas uas tau raug raped thiab tua nyob rau hauv Narborough, Leicestershire nyob rau hauv 1983 thiab 1986.
Ib sab saum toj no, 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 ib yam.
Ua li no, thawj rooj plaub ntawm DNA pov thawj yog dab tsi?
Xyoo 1987, Florida tus neeg ua phem ua phem Tommie Lee Andrews tau los ua tus ua ntej tus neeg hauv Teb Chaws Asmeskas yuav raug txiav txim los ntawm DNA pov thawj ; nws raug txim rau 22 xyoo tom qab tuav.
Puas muaj DNA kuaj hauv xyoo 1989?
Cov ntaub ntawv pov thawj muaj zog rau cov lus pom zoo no yog nrog cov ntaub ntawv tshwj xeeb uas tau sau los ntawm Tsoom Fwv Teb Chaws Saib Xyuas Kev Tshawb Fawb (FBI) txij li thaum nws tau pib ua pov thawj. Kev kuaj DNA hauv xyoo 1989.
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
Koj yuav ua pov thawj li cas tias tam sim no tus neeg xyuas pib tsim cov hlau nplaum?
Txhua tus neeg nqa khoom nqa tam sim no ua rau muaj qhov sib txawv ntawm qhov chaw nyob ib puag ncig nws tus kheej raws li kev tuav ntawm txoj cai sab xis (yog tias cov paib ua raws li tus ntiv tes xoo, cov ntiv tes curlin cov kev taw qhia ntawm cov hlau nplaum)
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
Qhov twg ntawm 1905 cov ntaub ntawv tau muab thawj qhov pov thawj zoo rau lub neej ntawm atom?
Annus mirabilis cov ntaub ntawv
Thaum twg koj yuav tsum siv correlation thiab thaum twg koj yuav tsum siv yooj yim linear regression?
Regression feem ntau yog siv los tsim cov qauv / qhov sib npaug los kwv yees cov lus teb tseem ceeb, Y, los ntawm cov txheej txheem kwv yees (X) sib txawv. Kev sib raug zoo feem ntau yog siv los ua kom sai thiab ua kom luv luv cov kev taw qhia thiab lub zog ntawm kev sib raug zoo ntawm ib pawg ntawm 2 lossis ntau tus lej sib txawv