Video: Lub ntsiab lus ntawm kev hloov caj ces yog dab tsi?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Genetic variation yog ib lo lus siv los piav txog qhov kev hloov pauv nyob rau hauv DNA ib theem zuj zus ntawm peb txhua tus genomes. Genetic variation ua rau ntau hom, lossis alleles?, ntawm gene.
Ib yam li ib tug yuav nug, 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.
Tom qab ntawd, lo lus nug yog, qhov kev hloov pauv caj ces yog dab tsi thiab vim li cas nws tseem ceeb? Genetic variation yog qhov tseem ceeb rau natural xaiv vim natural xaiv tuaj yeem nce lossis txo qhov zaus ntawm alleles uas twb muaj lawm hauv cov pejxeem. Genetic variation yog tshwm sim los ntawm: kev hloov pauv . random mating ntawm cov kab mob.
Ntawm no, 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.
Koj txiav txim siab txog kev hloov pauv caj ces li cas?
Ntawm cov tib neeg nyob rau hauv ib tug pej xeem Genetic variation kuj tuaj yeem txheeb xyuas los ntawm kev tshuaj xyuas kev hloov pauv nyob rau theem ntawm enzymes siv cov txheej txheem ntawm cov protein electrophoresis. Polymorphic noob muaj ntau tshaj ib qho allele ntawm txhua qhov chaw.
Pom zoo:
Lub ntsiab lus ntawm kev hloov pauv hauv kev txheeb cais yog dab tsi?
Variability hauv Statistics yog dab tsi? Variability (tseem hu ua kis los yog dispersion) yog hais txog kev nthuav tawm cov ntaub ntawv li cas. Variability muab txoj hauv kev los piav qhia ntau npaum li cas cov ntaub ntawv sib txawv thiab tso cai rau koj siv cov txheeb cais los sib piv koj cov ntaub ntawv rau lwm cov ntaub ntawv
Lub ntsiab lus ntawm lub hauv paus lo lus meter nyob rau hauv lo lus tus pas ntsuas kub yog dab tsi?
Lub hauv paus chiv keeb ntawm lo lus 'Thermometer' Qhov thib ob ntawm lo lus, 'meter', los ntawm Fabkis -mètre (uas muaj nws cov hauv paus hauv lub post-classical Latin: -meter, -metrumand lub ancient Greek, -Μέτρο ν, lossis metron, uas txhais tau tias ntsuas qee yam, xws li qhov ntev, qhov hnyav, lossis dav)
Dab tsi yog lub ntsiab lus ntawm kev hloov pauv lom neeg hauv cov ntsiab lus ntawm allele zaus?
Microevolution, los yog evolution ntawm ib tug me me, yog txhais raws li ib tug kev hloov nyob rau hauv lub zaus ntawm noob variants, alleles, nyob rau hauv ib tug pej xeem ntau tiam. Lub teb ntawm biology uas kawm txog allele frequencies nyob rau hauv cov pejxeem thiab yuav ua li cas lawv hloov lub sij hawm yog hu ua pej xeem noob caj noob ces
Yuav ua li cas cov khoom siv caj ces hauv txhua lub xov tooj tshiab tsim los ntawm kev faib tawm ntawm tes sib piv nrog cov khoom siv caj ces hauv lub xov tooj qub?
Mitosis tshwm sim nyob rau hauv ob lub nuclei uas zoo tib yam rau thawj nucleus. Yog li, ob lub hlwb tshiab tsim tom qab kev faib tawm ntawm tes muaj tib yam khoom siv caj ces. Thaum lub sij hawm mitosis, chromosomes condense los ntawm chromatin. Thaum saib nrog lub microscope, chromosomes pom nyob rau hauv lub nucleus
Dab tsi yog qhov flux los ntawm lub voos xwmfab ntawm sab yog tias tus nqi ntawm Q yog ntawm ib qho ntawm nws lub ces kaum?
Raws li peb paub tias, tag nrho cov flux los ntawm tus nqi q yog q / ε 0 (Gauss txoj cai). Yog hais tias tus nqi yog nyob rau ntawm lub ces kaum ntawm lub voos xwmfab, ib co ntawm cov flux nkag mus rau hauv lub voos xwmfab thiab tawm los ntawm ib co ntawm nws lub ntsej muag. Tab sis qee qhov flux tsis nkag mus rau hauv lub voos xwmfab. Qhov 1/8th no yuav muab faib ua 3 ntu dua