Cov txheej txheem:
Video: Dab tsi ntawm kev hloov pauv tshwm sim ntawm thymine thiab cytosine?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Muaj ob hom ntawm point kev hloov pauv : kev hloov kev hloov pauv thiab kev hloov pauv kev hloov pauv . Kev hloov pauv kev hloov pauv tshwm sim thaum lub hauv paus pyrimidine (piv txwv li, thymine [T] lub cytosine [C]) hloov rau lwm pyrimidine puag lossis thaum lub hauv paus purine (piv txwv li, adenine [A] lossis guanine [G]) hloov rau lwm lub hauv paus purine.
Kuj nug, 4 hom kev hloov pauv yog dab tsi?
Muaj peb hom DNA Mutations: lub hauv paus hloov, tshem tawm thiab ntxig
- Kev hloov pauv hauv paus. Ib qho kev hloov pauv yog hu ua point mutations, nco qab qhov kev hloov pauv ntawm Glu --- Val uas ua rau mob qog nqaij hlav.
- Kev tshem tawm.
- Insertions.
Ib yam li ntawd, hom kev hloov pauv dab tsi yog recombination? Thaum muaj kev hloov hauv cov khoom siv caj ces nws hu ua a kev hloov pauv . Ob qho tseem ceeb hom ntawm genetic exchange yog recombination thiab translocation. Recombination tshwm sim thaum cov khoom siv caj ces pauv ntawm homologous chromosomes.
Dhau li ntawm no, dab tsi yog ob hom kev hloov pauv ntawm cov ntsiab lus?
Muaj ob hom kev hloov pauv hloov pauv : puag hloov pauv thiab frameshift kev hloov pauv . Hauv qhov ua piv txwv no, C tau hloov los ntawm A, hloov qhov thib ob codon sib lawv liag. Frameshift kev hloov pauv tshwm sim thaum ib lub hauv paus ntxiv lossis tshem tawm.
Dab tsi yog qhov kev hloov pauv hloov pauv?
Kev hloov pauv hloov yog ib hom ntsiab lus tshwj xeeb kev hloov pauv , ib qho uas ib zaug purine hloov pauv rau pyrimidine lossis vice versa. Raws li qhov tshwm sim ntawm a kev hloov pauv hloov , cov hloov pauv Piv txwv li, txoj haujlwm hauv cov noob tuaj yeem muaj adenine nyob qhov twg nws muaj thymine lossis cytosine.
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
Thaum ib qho kev sib cais ua rau muaj kev hloov pauv hloov pauv ntawm lub ntiaj teb nce ntxiv?
Txij li thaum lub kaw lus raug cais tawm, tsis muaj cua sov tuaj yeem khiav tawm (tus txheej txheem yog li adiabatic), yog li thaum lub zog ntws tawm hauv lub cev, qhov entropy ntawm qhov system nce, piv txwv li Δ Ssys> 0. Yog li ntawd, lub entropy ntawm lub system yuav tsum tau nce rau ib tug spontaneous txheej txheem nyob rau hauv no cais system
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