Video: Qhov piv txwv xaiv stabilizing yog dab tsi?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Stabilizing xaiv nyob rau hauv evolution yog ib hom ntawm ntuj xaiv uas nyiam cov neeg nruab nrab hauv cov pej xeem. Classic piv txwv ntawm qhov zoo uas tshwm sim los ntawm ruaj khov xaiv suav nrog tib neeg qhov hnyav yug, tus naj npawb ntawm cov xeeb ntxwv, camouflage lub tsho tiv no xim, thiab cactus spine ceev.
Yog li ntawd, dab tsi yog ib qho piv txwv ntawm stabilizing xaiv hauv biology?
Hauv tib neeg, qhov hnyav thaum yug yog ib qho piv txwv ntawm stabilizing xaiv . Cov menyuam mos uas yug me me tuaj yeem poob cua sov yooj yim heev thiab tuaj yeem tuag, qhov uas cov menyuam yug los loj dhau tuaj yeem ua rau muaj teeb meem thaum yug menyuam thiab tuag ntawm leej niam lossis tus menyuam.
Qhov thib ob, dab tsi yog qhov ua rau muaj kev ruaj ntseg xaiv? Feem ntau ua rau kev ruaj ntseg xaiv Qee qhov feem ntau feem ntau cov ntaub ntawv ntawm xaiv yog los ntawm predation, kev faib peev txheej, xim ntawm ib puag ncig, hom zaub mov, thiab ntau yam ntawm lwm yam quab yuam.
Tsis tas li lo lus nug yog, txhais tau li cas los ntawm kev xaiv ruaj khov?
Stabilizing xaiv (tsis txhob totaub nrog qhov tsis zoo los yog ua kom huv xaiv ) yog hom ntuj xaiv uas cov pejxeem txhais tau tias stabilizes ntawm ib qho tshwj xeeb uas tsis yog qhov zoo tshaj tus nqi. Qhov no txhais tau tias uas feem ntau phenotype nyob rau hauv cov pejxeem yog xaiv rau thiab tseem yuav kav rau tiam tom ntej.
Dab tsi yog qhov sib txawv ntawm kev sib npaug thiab kev xaiv ruaj khov?
1 Teb. Feem ntau, Stabilizing xaiv yog ib lub tswv yim uas siv rau phenotypic zoo thaum sib npaug xaiv yog ib lub tswv yim uas siv rau qhov chaw muab. Sib npaug xaiv tuaj yeem yog vim qhov tsis zoo-zaus dependence xaiv los yog vim overdominance (= heterozygous kom zoo dua ntawm ib qho chaw).
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
Dab tsi yog qhov txawv ntawm instantaneous thiab nruab nrab ceev dab tsi yog qhov piv txwv loj tshaj ntawm kev ceev ceev?
Qhov nruab nrab ceev yog qhov ceev nruab nrab ntawm lub sijhawm. Instantaneous ceev yuav yog qhov ceev txhua qhov muab tam sim ntawd hauv lub sijhawm ntawd, ntsuas nrog lub ntsuas ntsuas lub sijhawm
Dab tsi yog qhov txawv ntawm microevolution thiab macroevolution Dab tsi yog qee qhov piv txwv ntawm txhua tus?
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