Video: Dab tsi yog daim duab qhia kev xaiv?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Daim duab 1 ua yeeb yam kev taw qhia xaiv , nyob rau hauv uas ib tug huab phenotype yog nyiam. Daim duab 2 piav ruaj khov xaiv , qhov twg qhov nruab nrab phenotype yog nyiam tshaj qhov zoo tshaj plaws. Daim duab 3 qhia kev cuam tshuam xaiv , nyob rau hauv uas huab phenotypes nyiam tshaj qhov nruab nrab.
Tsuas yog li ntawd, qhov kev taw qhia kev xaiv yooj yim yog dab tsi?
kev taw qhia 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 heev rau qhov zoo yog nyiam tshaj qhov tseem ceeb nruab nrab.
Tsis tas li ntawd, dab tsi yog qhov stabilizing xaiv daim duab? Lub ntsiab lus thiab ua rau Stabilizing Selection Stabilizing xaiv feem ntau qhia ntawm a daim duab raws li kev hloov kho tswb nkhaus qhov chaw nruab nrab yog nqaim thiab siab dua li lub tswb zoo li qub. Txij li thaum ruaj khov xaiv nyiam qhov nruab nrab ntawm txoj kev, kev sib xyaw ntawm cov noob feem ntau yog qhov pom.
Ib yam li ib tug yuav nug, qhov txawv ntawm kev taw qhia thiab kev cuam tshuam kev xaiv yog dab tsi?
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 raug xaiv rau.
4 hom kev xaiv yog dab tsi?
Stabilizing xaiv , kev taw qhia xaiv , kev xaiv ntau haiv neeg, kev xaiv ntau zaus, thiab kev xaiv kev sib deev txhua tus ua rau txoj hauv kev natural xaiv tuaj yeem cuam tshuam kev hloov pauv hauv cov neeg.
Pom zoo:
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
Qhov twg yog qhov zoo dua qhov kev xaiv ntuj los yog kev xaiv dag Yog vim li cas?
Thaum lub sij hawm xaiv ntuj, hom ciaj sia thiab kev yug me nyuam txiav txim siab cov yam ntxwv. Txawm hais tias tib neeg tuaj yeem txhim kho lossis ua rau lub cev muaj peev xwm los ntawm kev xaiv kev yug me nyuam, qhov xwm txheej cuam tshuam nws tus kheej nrog cov yam ntxwv uas tso cai rau qhov zoo rau cov tsiaj muaj peev xwm ua phooj ywg thiab muaj sia nyob
Dab tsi yog qhov sib txawv tseem ceeb ntawm kev xaiv cov phooj ywg thiab kev xaiv pab pawg?
Kev xaiv Kin, hais lus ntxhib, yog kev xaiv ntawm qhov sib txawv ntawm qhov tsis ncaj ncees (rb ≠ 0) uas tshwm sim hauv cov neeg siab-K (cov pej xeem uas muaj kev sib raug zoo ntawm cov txheeb ze); whereas kev xaiv pab pawg, kwv yees hais lus, yog kev xaiv ntawm qhov sib txawv ntawm qhov tsis muaj zog (rb ≠ 0) uas tshwm sim hauv cov neeg siab-G (cov pej xeem
Daim duab qhia chaw muaj txiaj ntsig dab tsi tshaj li daim duab?
Daim duab saum toj kawg nkaus muaj qhov zoo hauv qab no ntawm daim duab qhia: (1) Nws muab cov duab pom hauv av tam sim no uas tsis muaj daim ntawv qhia sib npaug. (2) Nws tau yooj yim dua. Daim duab yuav nyob rau hauv txhais tes ntawm tus neeg siv nyob rau hauv ob peb teev tom qab nws coj; daim ntawv qhia yuav siv sij hawm ntau lub hlis los npaj
Dab tsi yog qhov txawv ntawm lub xeev daim duab kos duab thiab daim duab ua haujlwm?
Lub xeev daim duab qauv yog siv los qhia qhov sib lawv liag ntawm lub xeev uas ib yam khoom mus dhau, qhov ua rau kev hloov ntawm ib lub xeev mus rau lwm qhov thiab qhov kev txiav txim uas tshwm sim los ntawm lub xeev hloov. Daim duab ua haujlwm yog ntws ntawm kev ua haujlwm yam tsis muaj qhov tshwm sim (kev tshwm sim) mechanism, lub xeev tshuab yog suav nrog lub xeev triggered