Qhov sib txawv tseem ceeb ntawm prezygotic thiab postzygotic yog tias prezygotic yog ib qho txheej txheem ntawm kev sib cais ntawm kev ua me nyuam, uas tiv thaiv kev fertilization ntawm lub qe thaum lub postzygotic yog ib tug mechanism ntawm kev sib cais ntawm cov me nyuam, uas tiv thaiv kev tsim ntawm cov me nyuam los yog fertile.
Ib hom yog ib pawg ntawm cov kab mob uas tuaj yeem sib deev nrog ib leeg thiab tsim cov xeeb ntxwv. Nyob rau hauv evolutionary nam, speciation yog ib qho tseem ceeb lub tswv yim. Hom kab mob yog ib pawg uas muaj kev sib deev. Prezygotic thiab postzygotic yog ob lub ntsiab kev sib cais ntawm kev sib deev. Kev rho menyuam tawm uas tshwm sim ua ntej fertilization yog prezygotic cais. Thaum lub sij hawm, qhov kev sib cais ntawm cov me nyuam uas tshwm sim tom qab fertilization thiab tiv thaiv lub qe fertilized los ua ib tug fertile offspring yog tom qab-zygotic cais.
Kev cais kev yug me nyuam yog dab tsi?
Kev sib cais yog hais txog cov txheej txheem uas tiv thaiv cov tsiaj los yog cov tswv cuab ntawm tib pab pawg los ntawm kev yug me nyuam los yog sib koom ua ke. Yog li, nws tiv thaiv kev tsim cov noob fertile. Ob peb lub tswv yim yog lub luag haujlwm rau kev sib cais ntawm kev sib deev. Ntawm lawv, prezygotic thiab postzygotic yog ob lub ntsiab mechanisms.
Kev cais Prezygotic yog dab tsi?
Prezygotic reproductive isolation is a mechanism of reproductive isolation uas tiv thaiv cov qe fertilization. Muaj ntau pawg ntawm prezygotic isolation mechanism. Lawv yog tus cwj pwm cais, kev nyob ib leeg, lub caij sib tw, kev sib cais, kev sib cais ntawm lub cev, kev sib cais ntawm gamete, thiab lwm yam. Thaum ob hom nyob hauv ib qho chaw sib txawv kiag li uas lawv tsis tuaj yeem sib ntsib, nws tiv thaiv fertilization, thiab nws paub. raws li kev nyob cais.
Daim duab 01: Prezygotic Isolation
Tsis tas li ntawd, thaum lub caij sib tw sib txawv ntawm cov hom, lawv tsis nyiam ua phooj ywg nrog ib leeg, thiab nws tseem yuav tiv thaiv kev sib koom ua ke ntawm cov phev thiab qe. Cov tib neeg yuav tsis haum rau ib leeg, lossis lawv cov gametes tuaj yeem ua tsis tau rau qee lub sijhawm. Ob qho laj thawj no kuj tuaj yeem tiv thaiv kev fertilization. Kev cais tus cwj pwm tshwm sim thaum hom tsiaj tsis paub txog kev sib deev rituals lossis thaum tsis muaj kev sib deev, thiab lwm yam.
Postzygotic Isolation yog dab tsi?
Postzygotic yog lwm txoj hauv kev ntawm kev sib cais ntawm kev sib deev uas tiv thaiv kev tsim ntawm cov xeeb ntxwv uas muaj txiaj ntsig lossis muaj txiaj ntsig zoo txawm tias kev ua tiav tiav. Hybrid inviability, hybrid breakdown, hybrid sterility yog cov laj thawj tseem ceeb rau kev rho tawm postzygotic. Lub zygote uas tsim los ntawm fertilization yuav tsis muaj peev xwm txhawb nqa nws lub neej.
Tsis tas li ntawd, cov zygote uas tsim tawm yuav tsis paub tab txaus los tsim cov xeeb ntxwv (tsis paub tab zygote). Txawm hais tias tus zygote loj tuaj rau hauv ib tug neeg laus, tus neeg laus yuav muaj qib fertility tsawg heev, yog li tsis muaj peev xwm yug tau ib tug xeeb ntxwv. Tag nrho cov xwm txheej no tuaj yeem ua lub luag haujlwm rau kev rho tawm postzygotic thiab tiv thaiv kev tsim cov xeeb tub.
Dab tsi zoo sib xws ntawm Prezygotic thiab Postzygotic Isolation?
- Prezygotic isolation thiab postzygotic isolation is two mechanisms of reproductive isolation.
- Ob leeg tiv thaiv kev tsim cov noob qoob loo.
- Lawv yog cov txheej txheem evolutionary tseem ceeb.
Qhov txawv ntawm Prezygotic thiab Postzygotic yog dab tsi?
Prezygotic thiab postzygotic yog ob lub tswv yim ntawm kev sib cais ntawm kev sib deev. Prezygotic isolation tiv thaiv lub qe fertilization thaum postzygotic cais tiv thaiv kev tsim ntawm ib tug fertile offspring. Ob qho tib si thaum kawg thaiv kev sib tw thiab tsim cov xeeb ntxwv.
Cov hauv qab no qhia txog qhov sib txawv ntawm prezygotic thiab postzygotic cais nyob rau hauv daim ntawv tabular.
Summary – Prezygotic vs Postzygotic
Qhov tsis muaj peev xwm ntawm cov tswv cuab ntawm hom kev ua niam txiv thiab tsim cov xeeb ntxwv yog qhov tshwm sim hu ua kev sib cais cais tawm. Muaj cov txheej txheem ntawm lub luag haujlwm rau qhov no. Prezygotic thiab postzygotic yog ob lub tswv yim. Prezygotic cais tawm tiv thaiv kev sib koom ua ke ntawm cov phev thiab qe thaum qhov kev cais tawm tom qab tiv thaiv kev tsim cov xeeb ntxwv txawm tias tom qab fertilization. Qhov no yog qhov txawv ntawm prezygotic thiab postzygotic cais.
