Video: Yuav ua li cas yog tag nrho cov xaiv rog thiab mechanisms ntawm evolution?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Allele frequencies nyob rau hauv ib tug pej xeem yuav hloov vim plaub lub hauv paus zog ntawm evolution : Natural Selection, Genetic Drift, Mutations thiab Gene Flow. Kev hloov pauv yog qhov kawg ntawm cov alleles tshiab hauv cov noob caj noob ces. Qhov thib ob qhov tseem ceeb tshaj plaws mechanisms ntawm evolutionary kev hloov pauv yog: Natural Selection thiab Genetic Drift.
Tom qab ntawd, ib tug kuj yuav nug, dab tsi yog 5 lub tswv yim loj ntawm evolution?
Muaj tsib lub tswv yim tseem ceeb uas ua rau cov pej xeem, ib pab pawg ntawm cov kab mob sib cuam tshuam ntawm ib hom kab mob, ua kom pom kev hloov pauv ntawm allele zaus ntawm ib tiam mus rau lwm tiam. Cov no yog evolution los ntawm: kev hloov pauv , genetic drift , gene ntws , kev sib tw tsis sib xws, thiab natural xaiv (yav dhau los tau tham ntawm no).
Tom qab ntawd, lo lus nug yog, dab tsi yog 7 mechanisms ntawm evolution? Mechanisms ntawm evolution Hais txog kev ua txhaum cai ntawm Hardy-Weinberg kev xav. Lawv yog: kev hloov pauv, kev sib txuas tsis sib xws, cov noob ntws, qhov loj ntawm cov pejxeem loj (genetic drift), thiab kev xaiv ntuj.
Tom qab ntawd, dab tsi yog kev xaiv rog hauv evolution?
a) Natural Selection - Kev xaiv ntuj yog ib lub tswv yim ntawm kev hloov pauv uas tshwm sim thaum ib puag ncig ntuj xaiv rau lossis tawm tsam ib qho tshwj xeeb. Qhov no xaiv siab (los yog xaiv quab yuam) ua rau qee cov alleles ua ntau dua hauv cov pejxeem.
Dab tsi yog 8 mechanisms ntawm evolution?
Kev hloov pauv, kev tsiv teb tsaws (gene flow), genetic drift, thiab natural selection as mechanisms ntawm kev hloov; Qhov tseem ceeb ntawm kev hloov caj ces; random xwm ntawm genetic drift thiab cov teebmeem ntawm ib tug txo nyob rau hauv genetic variation; Yuav ua li cas variation, sib txawv me nyuam, thiab heredity tshwm sim evolution los ntawm kev xaiv ntuj; thiab.
Pom zoo:
Vim li cas nws yog ib lub tswv yim zoo los cawm tag nrho cov txheej txheem ntawm koj cov extraction kom txog thaum kawg ntawm kev sim?
Kev ua yuam kev thaum lub sijhawm rho tawm (piv txwv li nqa nrog cov txheej txheem tsis raug), tuaj yeem daws tau yog tias cov kev daws tsis tau muab tso rau hauv lub thawv pov tseg! Cov khaubncaws sab nraud povtseg yuav tsum tau txais kev cawmdim kom txog thaum tom qab evaporation vim hais tias cov khoom xav tau yuav tsis soluble heev hauv cov kuab tshuaj siv
Yuav ua li cas koj sau ib feem raws li ib tug khoom ntawm ib tug tag nrho cov zauv thiab ib feem feem?
Cov cai los nrhiav cov khoom ntawm ib feem feem thiab tag nrho tus lej Peb xub sau tag nrho cov lej ua ib feem, piv txwv li, sau nws faib los ntawm ib qho; Piv txwv li: 7 yog sau ua 71. Peb mam li muab cov zauv. Peb muab cov denominators. Yog tias yuav tsum tau ua kom yooj yim, nws ua tiav thiab tom qab ntawd peb sau cov feem kawg
Yuav ua li cas yog lub sum ntawm cov atomic masses ntawm tag nrho cov atoms nyob rau hauv ib tug qauv rau ib tug compound?
Cov mis loj ntawm ib yam khoom yog qhov sib npaug ntawm qhov nruab nrab atomic masses ntawm txhua lub atom sawv cev hauv cov tshuaj formula thiab qhia nyob rau hauv atomic mass units. Cov mis loj ntawm covalent compound tseem hu ua molecular mass
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
Ntau npaum li cas ntawm cov pej xeem hauv ntiaj teb nyob ntawm cov kab ke roob rau tag nrho lossis qee qhov ntawm lawv cov dej?
Roob yog lub ntiaj teb "dej yees," muab 60-80% ntawm tag nrho cov dej tshiab rau peb ntiaj chaw. Tsawg kawg ib nrab ntawm lub ntiaj teb cov pej xeem nyob ntawm roob ecosystem kev pabcuam kom muaj sia nyob - tsis yog dej xwb, tab sis kuj muaj zaub mov thiab lub zog huv