Video: Qhov feem pua ntawm DNA tau koom nrog cov tswv cuab ntawm tib neeg?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Muaj ntau tshaj peb lab qhov sib txawv ntawm koj cov genome thiab lwm tus. Ntawm qhov tod tes, peb txhua tus yog 99.9 feem pua tib yam, DNA - txawj ntse. (Los ntawm qhov sib txawv, peb tsuas yog hais txog 99 feem pua tib yam li peb cov txheeb ze ze tshaj plaws, chimpanzees.)
Ib yam li ntawd, tej zaum koj yuav nug, peb muab DNA ntau npaum li cas?
Los ntawm kev tsim txiaj ntawm kev ua tib hom, txhua tus tib neeg qhia 99% ntawm lawv cov genome, uas txhais tau hais tias tag nrho cov tib neeg yog 99% genetic zoo sib xws. Peb lub cev yog tsim los ntawm 3 billion genetic tsev blocks, los yog hauv paus khub. Ntawm cov 3 billion lub hauv paus khub, tsuas yog ib qho me me xwb rau peb.
Tsis tas li ntawd, noob neej txawv li cas? Thaum lub caj ces qhov sib txawv ntawm tus kheej tib neeg niaj hnub no yog minuscule - txog 0.1%, qhov nruab nrab - kev kawm ntawm tib yam ntawm chimpanzee genome qhia qhov txawv ntawm li 1.2%.
Tsis tas li ntawd, tib neeg puas koom tib DNA?
Ib qho kev txo hwj chim tshwm sim: peb DNA blueprints yog ze li ntawm 99 feem pua zoo tib yam rau lawv. Ntawd yog, ntawm peb billion tsab ntawv uas ua rau tib neeg genome, tsuas yog 15 lab ntawm lawv-tsawg dua 1 feem pua-tau hloov pauv hauv rau lab xyoo los yog li ntawd txij li thaum tib neeg thiab chimp lineages diverged.
Ntau npaum li cas ntawm tib neeg DNA yog txiav txim?
Kwv yees li 95% ntawm cov nucleotide sib lawv liag tib neeg genome paub. Txawm li cas los xij, yog tias koj txhais tau tias " txiav txim siab "Dab tsi cov genome encodes kom deb li deb raws li functionality, nws yog kwv yees hais tias tsuas yog 3% ntawm cov genome muaj tshwm sim raws li noob caj noob ces. DNA cov kab ke uas encode proteins.
Pom zoo:
Dab tsi yog qhov sib txawv ntawm cov alleles ntawm cov tib neeg hauv cov pej xeem hu ua?
Cov Txheej Txheem Sib Sau ntawm Alleles hauv Cov Pej Xeem yog Nws Gene Pas. Population geneticists kawm txog qhov sib txawv uas ib txwm tshwm sim ntawm cov noob hauv cov pejxeem. Kev sau ntawm tag nrho cov noob thiab ntau hom kev hloov pauv lossis allelic ntawm cov noob hauv cov pejxeem yog hu ua nws cov gene pool
Yuav ua li cas koj thiaj nrhiav tau cov mis empirical nrog feem pua?
Transcript Faib txhua % los ntawm atomic mass ntawm lub caij. Faib txhua cov lus teb los ntawm qhov tsawg tshaj plaws. Kho cov lej no rau hauv lawv qhov qis tshaj tus lej tag nrho
Tus tswv cuab ntawm tsev neeg cov pa oxygen twg yog hlau?
Khoom: Oxygen; Polonium; Selenium; Sulfur
Puas muaj DNA ntau npaum li cas tib neeg koom nrog cov tsiaj nyeg?
Kom meej meej, acorn worms tsis zoo li tib neeg; cov worms tsis muaj ceg tawv thiab ua pa los ntawm cov slits hauv lawv lub plab. Tab sis lawv sib koom kwv yees li 14,000 cov noob nrog tib neeg, cov kws tshawb fawb pom, suav nrog txog 70 feem pua ntawm tib neeg genome
Puas yog cov viscosities ntawm magmas nce nrog nce feem pua ntawm silica?
Lub viscosities ntawm magmas nce nrog nce feem pua ntawm silica. Kev tawg ntawm Hawaii volcanoes tej zaum yuav piav raws li tawg nyob rau hauv piv rau 1980 Mount St. Helens eruption. Basaltic lavas feem ntau yog kub dua thiab khov dua li andesite lavas