Video: Dab tsi yog lub ntsiab lus ntawm kev taw qhia kev xaiv?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Hauv cov noob caj noob ces, kev taw qhia kev xaiv yog hom ntawm ntuj tsim xaiv nyob rau hauv uas ib tug huab phenotype yog nyiam tshaj lwm phenotypes, ua rau lub allele zaus hloov lub sij hawm nyob rau hauv cov kev taw qhia ntawm phenotypes.
Tsis tas li ntawd, dab tsi yog ib qho piv txwv ntawm kev xaiv kev taw qhia?
Ib piv txwv ntawm txoj kev xaiv yog cov ntaub ntawv fossil uas qhia tau hais tias qhov loj ntawm cov bears dub hauv Tebchaws Europe tau txo qis thaum lub sijhawm interglacial ntawm lub hnub nyoog dej khov, tab sis tau nce ntxiv thaum lub sijhawm glacial. Lwm tus piv txwv yog lub beak loj nyob rau hauv cov pejxeem ntawm finches.
Dab tsi yog txoj kev xaiv yooj yim? kev taw qhia kev xaiv : ib hom ntawm ntuj xaiv nyob rau hauv uas ib tug phenotype yog nyiam, ua rau lub allele zaus mus tas li hloov nyob rau hauv ib qho kev taw qhia. cuam tshuam xaiv : (los yog diversifying xaiv ) ib hom ntawm ntuj xaiv nyob rau hauv uas qhov tseem ceeb tshaj plaws rau qhov zoo yog nyiam tshaj qhov tseem ceeb nruab nrab.
Hauv qhov no, dab tsi yog qhov zoo tshaj plaws txhais ntawm kev taw qhia kev xaiv?
ib txoj kev uas ob hom tsis tuaj yeem tsim dua tshiab. ib tug txheej txheem uas ib tug ntawm cov huab variations ntawm ib tug zoo nyiam. ib tug txheej txheem los ntawm cov neeg uas muaj ob qho tag nrho ntawm ib tug zoo nyiam.
Dab tsi yog qhov txawv ntawm kev cuam tshuam thiab kev taw qhia kev xaiv?
Kev taw qhia kev xaiv tau piav raws li qhov xaiv rau ib qho tshwj xeeb phenotype hauv pejxeem as opposed to the other phenotypes. Kev xaiv cuam tshuam yog thaum cov pejxeem muaj xaiv pressures ua raws li nws uas xaiv tawm tsam qhov nruab nrab phenotypes thiab huab phenotypes yog xaiv rau.
Pom zoo:
Dab tsi yog qhov txiaj ntsig tseem ceeb ntawm kev taw qhia ntawm tes los ntawm kev sib cuag lub cev ncaj qha?
Kev taw qhia kuj tshwm sim ntawm cov hlwb uas yog kev sib cuag ntawm lub cev. Kev sib cuam tshuam ntawm cov proteins ntawm qhov chaw ntawm cov hlwb tuaj yeem ua rau muaj kev hloov pauv hauv cov cwj pwm ntawm tes. Piv txwv li, cov proteins nyob rau saum npoo ntawm T-cells thiab antigen nthuav tawm cov hlwb sib cuam tshuam los ua kom muaj kev taw qhia hauv T-cells
Dab tsi yog qhov txawv ntawm kev xaiv kev taw qhia thiab kev xaiv cuam tshuam?
Hauv kev xaiv cov kev taw qhia, cov pej xeem cov noob caj noob ces hloov mus rau qhov tshiab phenotype thaum raug kev hloov pauv ib puag ncig. Hauv kev sib txawv lossis kev cuam tshuam kev xaiv, qhov nruab nrab lossis nruab nrab phenotypes feem ntau tsis haum dua li qhov phenotype huab cua thiab tsis zoo li yuav ua rau muaj txiaj ntsig zoo hauv cov pej xeem
Dab tsi yog qhov feem ntau yuav ua rau kev xaiv kev taw qhia?
Kev xaiv kev taw qhia tshwm sim feem ntau nyob rau hauv ib puag ncig kev hloov pauv thiab thaum cov neeg tsiv teb tsaws chaw mus rau thaj chaw tshiab nrog kev sib txawv ntawm ib puag ncig. Kev xaiv kev taw qhia tso cai rau kev hloov pauv sai hauv cov zaus ntawm allele, thiab ua lub luag haujlwm tseem ceeb hauv speciation
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
Dab tsi yog lub ntsiab lus tseem ceeb hauv Darwin txoj kev xav ntawm evolution los ntawm kev xaiv ntuj?
Cov no yog cov ntsiab lus tseem ceeb ntawm kev hloov pauv los ntawm kev xaiv ntuj raws li tau hais los ntawm Darwin: Ntau tus neeg raug tsim tawm txhua tiam tshaj li muaj sia nyob. Phenotypic variation muaj nyob rau hauv cov tib neeg thiab cov variation yog heritable. Cov neeg uas muaj cuab yeej cuab tam zoo dua rau ib puag ncig yuav muaj sia nyob