Video: Kev yug me nyuam li cas muab kev hloov pauv?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Qhov no puas pab tau?
Yog · Tsis yog
Hais txog qhov no, vim li cas kev sib deev kev sib deev yog qhov kev hloov ntawm caj ces?
Piav vim li cas kev sib deev yog a qhov chaw ntawm genetic variation . Kev sib deev tso cai rau ntau yam thiab nws tso cai rau hom evolve thiab hloov raws sijhawm. Ib hom tshiab tuaj yeem tsim tau thaum ib pab pawg neeg tseem nyob sib cais los ntawm lwm yam ntawm nws cov tsiaj ntev txaus los hloov cov yam ntxwv sib txawv.
Tsis tas li ntawd, kev hloov pauv tau tshwm sim li cas hauv kev yug me nyuam asexual? Hauv kev yug me nyuam asexual ib daim qauv ntawm cov noob caj noob ces yog tsim los ntawm niam txiv kab mob (ib clone). Tsis zoo li kev sib deev kev yug me nyuam , kev yug me nyuam asexual tsuas yog qhia txog caj ces kev hloov pauv nyob rau hauv cov pejxeem yog ib tug random mutation nyob rau hauv lub cev DNA kis mus rau cov xeeb leej xeeb ntxwv.
Hais txog qhov no, qhov tseem ceeb ntawm kev hloov pauv hauv kev sib deev yog dab tsi?
Hauv qhov xwm txheej, kev hloov pauv tshwm sim thaum kev sib deev . Yog qhov no kev hloov pauv yog qhov muaj txiaj ntsig zoo rau hom, nws raug xaiv thiab tseem nyob hauv cov pej xeem. Qhov no yog vim lub variant hom yog ntau yoog. Yog li ntawd, lawv muaj peev xwm ciaj sia zoo dua thiab yug me nyuam xa cov noob rau cov xeeb ntxwv.
3 hom kev hloov caj ces yog dab tsi?
Muaj peb qhov chaw ntawm kev hloov caj ces: kev hloov pauv , gene ntws , thiab kev sib deev. A kev hloov pauv tsuas yog qhov hloov pauv hauv DNA. Kev hloov pauv lawv tus kheej tsis tshua muaj tshwm sim thiab feem ntau ua rau muaj kev phom sij rau tib neeg. Vim li no, kev hloov pauv feem ntau yog xaiv tawm tsam los ntawm cov txheej txheem evolutionary.
Pom zoo:
Vim li cas tom qab kev hloov pauv kev hloov pauv tseem ceeb?
Kev hloov pauv tom qab kev txhais lus (PTMs) xws li glycosylation thiab phosphorylation ua lub luag haujlwm tseem ceeb ntawm kev ua haujlwm ntawm hemostatic proteins thiab tseem ceeb heev hauv kev teeb tsa kab mob. Xws li theem nrab hloov pauv rau cov proteins hemostatic muaj ntau yam cuam tshuam rau lawv lub peev xwm los cuam tshuam nrog lwm cov proteins
Dab tsi yog qhov txawv ntawm ib puag ncig kev hloov pauv thiab kev hloov pauv qub txeeg qub teg?
Qhov sib txawv ntawm cov yam ntxwv ntawm cov tib neeg ntawm tib hom yog hu ua variation. Qhov no yog inherited variation. Qee qhov kev hloov pauv yog qhov tshwm sim ntawm qhov sib txawv ntawm ib puag ncig, lossis ib tus neeg ua dab tsi. Qhov no yog hu ua environmental variation
Cov kev hloov ntawm lub cev txawv ntawm cov tshuaj hloov pauv li cas muab ib qho piv txwv ntawm txhua tus?
Kev hloov tshuaj lom neeg tshwm sim los ntawm cov tshuaj tiv thaiv tshuaj, thaum lub cev hloov pauv yog thaum cov teeb meem hloov pauv tab sis tsis yog tshuaj lom neeg. Piv txwv ntawm kev hloov tshuaj lom neeg yog hlawv, ua noj, xeb, thiab rotting. Piv txwv ntawm kev hloov lub cev yog boiling, melting, khov, thiab shredding
Thaum ib qho kev sib cais ua rau muaj kev hloov pauv hloov pauv ntawm lub ntiaj teb nce ntxiv?
Txij li thaum lub kaw lus raug cais tawm, tsis muaj cua sov tuaj yeem khiav tawm (tus txheej txheem yog li adiabatic), yog li thaum lub zog ntws tawm hauv lub cev, qhov entropy ntawm qhov system nce, piv txwv li Δ Ssys> 0. Yog li ntawd, lub entropy ntawm lub system yuav tsum tau nce rau ib tug spontaneous txheej txheem nyob rau hauv no cais system
Kev yug me nyuam tau hloov zuj zus li cas?
Kev hloov pauv ntawm kev sib deev muaj ob lub ntsiab lus tseem ceeb sib txawv: nws keeb kwm thiab nws txoj kev tu. Lub hauv paus chiv keeb ntawm kev sib deev muaj peev xwm taug qab mus rau prokaryotes thaum ntxov, nyob ib ncig ntawm ob txhiab xyoo dhau los (Gya), thaum cov kab mob pib pauv cov noob los ntawm kev sib txuas, hloov pauv, thiab hloov pauv