Video: Qhov kev hloov pauv qub qub txhais li cas?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Kev hloov pauv nyob rau hauv ib tug yam ntxwv uas yog qhov tshwm sim ntawm cov ntaub ntawv caj ces los ntawm cov niam txiv yog hu ua kev hloov pauv qub txeeg qub teg . Qhov no yog vim lawv tau ib nrab ntawm lawv cov DNA thiab tau qub txeeg qub teg nta ntawm txhua tus niam txiv.
Hais txog qhov no, dab tsi ua rau muaj kev hloov pauv qub txeeg qub teg?
Kev hloov pauv uas yog qub txeeg qub teg yog vim qhov sib txawv ntawm cov alleles (los yog cov khoom siv caj ces). Qhov no los ntawm meiosis, piv txwv li ywj siab assortment / gametes nrog ½ chromosomes thiaj li sib tov ntawm 2 niam txiv.
Kuj Paub, qhov piv txwv ntawm kev hloov caj ces yog dab tsi? Qhov laj thawj tseem ceeb ntawm kev hloov pauv suav nrog kev hloov pauv, noob ntws, thiab kev sib deev. DNA mutation ua rau noob caj noob ces variation los ntawm kev hloov cov noob ntawm tib neeg hauv cov neeg. Piv txwv ntawm kev hloov pauv caj ces suav nrog qhov muag xim, hom ntshav, camouflage nyob rau hauv cov tsiaj, thiab nplooj hloov pauv hauv cov nroj tsuag.
Hauv qhov no, qhov txawv ntawm ib puag ncig thiab kev hloov pauv qub txeeg qub teg yog dab tsi?
Cov sib txawv hauv cov yam ntxwv nruab nrab cov neeg ntawm tib hom yog hu ua kev hloov pauv . Qhov no yog kev hloov pauv qub txeeg qub teg . Ib txhia kev hloov pauv yog qhov tshwm sim ntawm sib txawv hauv cov ib puag ncig, los yog dab tsi tus neeg ua. Qhov no hu ua ib puag ncig variation.
Dab tsi yog 2 hom kev hloov pauv?
Hom Variation Variation nyob rau hauv ib hom yog tsis tshua muaj, tab sis yeej muaj ob yam loj ntawm kev hloov pauv nyob rau hauv ib hom: nruam kev hloov pauv thiab tsis tu ncua kev hloov pauv . Tsis tu ncua kev hloov pauv yog qhov txawv hom kev hloov pauv muab faib rau ntawm qhov txuas ntxiv.
Pom zoo:
Vim li cas cov hnub qub dhau los ntawm kev hloov pauv hloov pauv?
Stellar evolution yog tus txheej txheem uas lub hnub qub hloov pauv nyob rau lub sijhawm. Cov hnub qub uas muaj tsawg kawg yog ib nrab ntawm lub hnub tuaj yeem pib tsim lub zog los ntawm kev sib xyaw ntawm helium ntawm lawv cov tub ntxhais, thaum lub hnub qub ntau dua tuaj yeem sib xyaw cov ntsiab lus hnyav dua raws li cov khoom sib xyaw ua ke
Dab tsi yog qhov kev hloov pauv hloov pauv?
Kev hloov pauv, hauv molecular biology, yog hais txog kev hloov pauv hauv deoxyribonucleic acid (DNA), qhov twg ib qho (ob lub nplhaib) purine hloov pauv rau (ib lub nplhaib) pyrimidine, los yog vice versa
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
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