Video: Dab tsi yog kev hloov pauv hauv cov kab mob muaj sia?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Kev hloov pauv , hauv biology, txhua qhov sib txawv ntawm cov cell, tus kheej kab mob , los yog pawg ntawm organismof txhua hom tshwm sim los ntawm kev sib txawv ntawm caj ces (genotypic kev hloov pauv ) los yog los ntawm cov nyhuv ntawm Environmental factor ntawm kev nthuav qhia ntawm genetic muaj peev xwm (phenotypic kev hloov pauv ).
Ib qho piv txwv ntawm kev hloov pauv yog dab tsi?
Piv txwv ntawm nruam kev hloov pauv suav nrog tej yam xws li tus neeg qhov siab thiab qhov hnyav. Piv txwv ntawm tsis txuas ntxiv kev hloov pauv suav nrog ib tug neeg cov ntshav los yog xim ntawm ib hom noog. Cov no kev hloov pauv tuaj yeem nyob rau ob qho laj thawj loj.
Kuj Paub, Dab tsi yog qhov tseem ceeb ntawm kev hloov pauv hauv hom? Genetic variation yog qhov muaj txiaj ntsig zoo rau cov pej xeem vim nws ua rau qee tus neeg hloov mus rau ib puag ncig thaum tswj kev ciaj sia ntawm cov pejxeem. Cov noob caj noob ces kev hloov pauv tsim ib lub pas dej loj loj ntawm qhov zoo hauv a hom yog li ntawd muab ib puag ncig tshiab, tsawg kawg ib tus neeg yuav muaj qhov zoo xav tau kom muaj sia nyob.
Tom qab ntawd, kev hloov pauv tshwm sim li cas hauv cov tsiaj muaj sia?
Cov noob caj noob ces kev hloov pauv tuaj yeem tshwm sim los ntawm kev hloov pauv (uas tuaj yeem tsim cov alleles tshiab hauv cov pejxeem), randommating, random fertilization, thiab recombination ntawm homologouschromosomes thaum lub sij hawm meiosis (uas reshuffles alleles hauv ib qho lub cev xeeb ntxwv).
3 hom kev hloov caj ces yog dab tsi?
Muaj peb qhov chaw ntawm noob caj noob ces : kev hloov pauv, noob ntws, thiab kev sib deev kev sib deev. Kev hloov pauv tsuas yog hloov pauv hauv DNA. Kev hloov pauv lawv tus kheej tsis tshua muaj tshwm sim thiab feem ntau ua rau muaj kev phom sij rau tib neeg. Vim li no, kev hloov pauv feem ntau yog xaiv tawm tsam los ntawm cov txheej txheem evolutionary.
Pom zoo:
Dab tsi yog qhov txawv ntawm ib puag ncig kev hloov pauv thiab kev hloov pauv qub txeeg qub teg?
Qhov sib txawv ntawm cov yam ntxwv ntawm cov tib neeg ntawm tib hom yog hu ua variation. Qhov no yog inherited variation. Qee qhov kev hloov pauv yog qhov tshwm sim ntawm qhov sib txawv ntawm ib puag ncig, lossis ib tus neeg ua dab tsi. Qhov no yog hu ua environmental variation
Dab tsi yog kev saib xyuas ntawm kev ruaj ntseg sab hauv txawm tias muaj kev hloov pauv hauv ib puag ncig sab nraud?
Kev saib xyuas ntawm kev ruaj ntseg sab hauv txawm tias muaj kev hloov pauv hauv ib puag ncig sab nraud yog hu ua homeostasis
Dab tsi tsim cov roj siab thiab nws hloov pauv li cas nrog kev hloov pauv hauv kinetic zog?
Gas siab yog tshwm sim los ntawm kev sib tsoo ntawm cov khoom siv roj nrog rau sab hauv ntawm lub thawv thaum lawv sib tsoo nrog thiab tawm dag zog rau ntawm phab ntsa ntim. Tom qab ntawd cov roj yog cua sov. Raws li qhov kub ntawm cov roj nce, cov khoom tau nce lub zog kinetic thiab lawv cov nrawm nrawm
Kev hloov pauv hauv cov kab mob caj ces yog dab tsi?
Cov kab mob hloov pauv yog cov txheej txheem ntawm kev hloov cov noob kab rov tav uas qee cov kab mob coj mus rau txawv teb chaws genetic khoom (liab DNA) los ntawm ib puag ncig. Nws tau tshaj tawm thawj zaug hauv Streptococcus pneumoniae los ntawm Griffith hauv xyoo 1928. Cov kab mob no yog hu ua cov hlwb muaj peev xwm
Dab tsi yog cov kab mob piav qhia cov kab mob ntawm tes hauv kev nthuav dav?
Cov kab mob yog cov prokaryotes, tsis muaj cov nuclei zoo thiab cov kab mob sib txuas ua ke, thiab nrog cov chromosomes tsim los ntawm ib lub voj voog DNA kaw. Lawv tuaj nyob rau hauv ntau yam duab thiab ntau thiab tsawg, los ntawm feeb spheres, cylinders thiab kauv threads, rau flagellated rods, thiab filamentous chains