Video: Thaum twg DNA pib siv los ntawm tub ceev xwm?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Xyoo 1986 yog thaum DNA ua ntej siv nyob rau hauv kev tshawb nrhiav txhaum cai los ntawm Dr. Jeffreys. 1986. Kev tshawb nrhiav siv genetic fingerprinting nyob rau hauv ib rooj plaub ntawm ob rapes thiab murders uas tau tshwm sim nyob rau hauv 1983 thiab 1986.
Ntawm no, thaum twg kuaj DNA pib hauv Asmeskas?
Nyob rau hauv 1987, Florida rapist Tommie Lee Andrews tau los ua thawj tus neeg nyob hauv U. S . yuav raug txim raws li qhov tshwm sim ntawm DNA pov thawj ; nws yog raug txim rau 22 xyoo tom qab tuav.
Tsis tas li ntawd, thawj rooj plaub twg daws DNA? Nws yog tus ua ntej tus neeg raug txim ntawm kev tua neeg nyob ntawm DNA fingerprinting pov thawj, thiab cov ua ntej yuav raug ntes raws li qhov tshwm sim ntawm pawg DNA kev tshuaj ntsuam. Pitchfork raped thiab tua ob tug ntxhais nyob rau hauv cov zos Leicestershire nyob ze, lub ua ntej hauv Narborough, lub Kaum Ib Hlis 1983, thiab thib ob hauv Enderby, thaum Lub Xya Hli 1986.
Ib yam li ntawd, koj tuaj yeem nug, 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.
Kev kuaj DNA yog qhov tseeb npaum li cas hauv cov teeb meem txhaum cai?
Cov cim siv ntau dua, qhov ntau dua raug , tab sis kuj tus nqi ntawm kuaj . 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.
Pom zoo:
Thaum twg qhov xwm thiab kev sib cav tswv yim pib?
1869 Ib yam li ntawd, dab tsi yog keeb kwm qab qhov xwm thiab kev sib cav sib ceg? Cov nature versus nurtur debate yog ib qho teeb meem qub tshaj plaws hauv kev puas siab puas ntsws. Cov kev sib cav lub hauv paus ntawm cov txheeb ze kev koom tes ntawm noob caj noob ces thiab ib puag ncig yam tseem ceeb rau tib neeg txoj kev loj hlob.
Tub ceev xwm siv chromatography li cas?
Hauv forensics, tub ceev xwm siv chromatography los txheeb xyuas thiab tshuaj xyuas cov khoom pom ntawm qhov chaw ua txhaum cai. Txhua qhov sib tov yog tsim los ntawm cov tshuaj molecules ntawm cov tshuaj sib txawv, hauv ntau qhov sib txawv. Chromatography ua haujlwm los ntawm kev sib cais cov tshuaj tawm ntawm qhov sib tov thiab kawm seb cov molecules coj li cas thaum lub sijhawm sib cais
Thaum twg qhov xwm txheej txhawb nqa kev sib cav pib?
Qhov kev sib cav tsis sib haum xeeb no tau muaj txij li xyoo 1869, thaum lo lus 'Nature Versus Nurture' tau tsim los ntawm Askiv polymath, Francis Galton. Cov neeg uas pom zoo nrog cov xwm txheej sib cav hais tias DNA thiab genotype uas peb yug los txiav txim siab peb yog leej twg thiab tus cwj pwm dab tsi thiab peb yuav muaj
Dab tsi yog qhov txawv ntawm instantaneous thiab nruab nrab ceev dab tsi yog qhov piv txwv loj tshaj ntawm kev ceev ceev?
Qhov nruab nrab ceev yog qhov ceev nruab nrab ntawm lub sijhawm. Instantaneous ceev yuav yog qhov ceev txhua qhov muab tam sim ntawd hauv lub sijhawm ntawd, ntsuas nrog lub ntsuas ntsuas lub sijhawm
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