Video: Vim li cas genetic drift tseem ceeb?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Drift ua rau muaj kev nce hauv homozygosity rau cov kab mob diploid thiab ua rau muaj kev nce hauv inbreeding coefficient. Tsav nce tus nqi ntawm caj ces kev sib txawv ntawm cov pejxeem yog tsis muaj noob ntws tshwm sim ntawm lawv. Genetic drift kuj muaj ob tseem ceeb ncua sij hawm evolutionary txim.
Yog li ntawd, yog vim li cas genetic drift tseem ceeb nyob rau hauv evolution?
Genetic drift ua rau evolution los ntawm random caij nyoog vim sampling yuam kev, whereas natural xaiv ua evolution ntawm lub hauv paus ntawm kev tawm dag zog. Hauv kev xaiv ntuj, cov tib neeg uas nws cov cuab yeej cuab tam ua rau lawv zoo dua (zoo dua tuaj yeem muaj sia nyob thiab rov tsim dua tshiab) tawm cov xeeb ntxwv ntau dua rau lwm cov tswv cuab ntawm cov pej xeem.
Ib tug kuj yuav nug, dab tsi yog caj ces drift thiab piv txwv? Genetic drift yog ib qho kev hloov ntawm qhov zaus ntawm ib qho allele hauv cov neeg nyob rau lub sijhawm. Qhov no hloov nyob rau hauv zaus ntawm allele los yog noob variation yuav tsum tshwm sim random nyob rau hauv thiaj li yuav genetic drift tshwm sim. Cov pej xeem ntawm luav tuaj yeem muaj xim av pluav thiab cov plaub dawb nrog cov plaub hau xim av yog cov tseem ceeb allele.
Nyob rau hauv no txoj kev, dab tsi yog genetic drift?
Genetic drift (tseem hu ua allelic drift los yog cov nyhuv Sewall Wright) yog qhov hloov pauv ntawm qhov zaus ntawm qhov uas twb muaj lawm noob variant (allele) nyob rau hauv ib tug pej xeem vim random sampling ntawm kab mob. Ib tug pej xeem lub allele zaus yog ib feem ntawm cov ntawv luam ntawm ib tug noob uas qhia ib daim ntawv.
Yuav ua li cas genetic drift txawv ntawm natural xaiv?
Qhov sib txawv tseem ceeb yog qhov hauv genetic drift allele frequencies hloov los ntawm lub caij nyoog, whereas nyob rau hauv natural xaiv allele frequencies hloov pauv los ntawm qhov sib txawv ntawm kev yug me nyuam. Ntuj xaiv yog tus txheej txheem uas feem ntau adaptive zoo rau ib puag ncig ua ntau ntau tiam tom qab tiam.
Pom zoo:
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