Video: Dab tsi yog qhov hloov pauv hauv Levelling?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Hloov Point (TP) Ib qho kev cuam tshuam taw tes nruab nrab ntawm BMs los yog TBMs raws li qhov backsight thiab foresight yog coj. Backsight (BS) Ib tug qws nyeem los ntawm "saib rov qab" ntawm a taw tes paub qhov nce xws li BM lossis TP.
Ib yam li ntawd, nws raug nug, dab tsi yog qhov hloov pauv hauv Levelling?
A Hloov Point (C. P) yog a taw tes uas qhia txog kev hloov ntawm cov qib . Nws yog ib taw tes nyob rau qhov twg fore and back sights are taken. Txhua yam khoom ruaj khov thiab txhais tau zoo xws li ciam teb pob zeb, curbstone, rail, pob zeb, thiab lwm yam, yog siv los ua ib qho hloov point . Ib qho Benchmark kuj yuav raug coj los ua hloov point.
Tsis tas li ntawd, qhov hloov pauv tseem ceeb txhais li cas? A tig point yog lub sijhawm tshwj xeeb, tseem ceeb thaum qee yam pib hloov. Cov keeb kwm yuav hais tias Rosa Parks qhov kev tawm tsam lub npav nto moo yog ib qho tig point hauv Civil Rights Movement. Saib rov qab ntawm cov xwm txheej keeb kwm, nws yooj yim haum rau kos ntau yam cov ntsiab lus tig.
Ua raws li qhov kev pom no, dab tsi yog qhov hloov pauv hauv kev tshawb fawb?
A tig point yog ib qho chaw nres tsheb, ib ntus lossis mus tas li, uas yog siv los ua qhov pivot ntawm cov cuab yeej ua ntu zus. Txij li thaum a tig point yog siv los txuas lub hauv paus kev soj ntsuam , nws qhov siab yuav tsum tau ua kom zoo dua qub (tsawg kawg rau lub sijhawm nws yuav siv sij hawm txav lub ntsuas thiab saib rov qab rau nws).
Lub ntsiab lus tig txhais li cas hauv kev nyeem ntawv?
Nyob rau hauv cov ntaub ntawv, lub tig point lub climax yog qhov point qhov siab tshaj plaws hauv kev piav qhia; nws yog qhov zoo siab tshaj plaws thiab nthuav tawm ib feem ntawm zaj dab neeg. Nws yog ib qho tseem ceeb thiab cov cuab yeej piav qhia tseem ceeb rau cov kws sau ntawv ntawm txhua yam, ob qho tib si tsis tseeb thiab tsis tseeb.
Pom zoo:
Dab tsi yog qhov kev hloov pauv hloov pauv?
Kev hloov pauv, hauv molecular biology, yog hais txog kev hloov pauv hauv deoxyribonucleic acid (DNA), qhov twg ib qho (ob lub nplhaib) purine hloov pauv rau (ib lub nplhaib) pyrimidine, los yog vice versa
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 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
Dab tsi ua rau muaj qhov hloov pauv hloov pauv?
Point kev hloov. Point mutation, hloov nyob rau hauv ib tug noob nyob rau hauv uas ib tug hauv paus khub nyob rau hauv lub DNA ib theem zuj zus yog hloov. Kev hloov pauv ntawm cov ntsiab lus feem ntau yog tshwm sim los ntawm kev ua yuam kev thaum lub sij hawm DNA replication, txawm hais tias kev hloov pauv ntawm DNA, xws li los ntawm kev cuam tshuam rau X-rays lossis rau ultraviolet hluav taws xob, kuj tuaj yeem ua rau muaj kev hloov pauv
Peb qhov laj thawj tseem ceeb ntawm kev hloov pauv hloov pauv yog dab tsi?
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. Ob ntawm cov txheej txheem tseem ceeb tshaj plaws ntawm kev hloov pauv hloov pauv yog: Natural Selection thiab Genetic Drift