2024 Tus sau: Elizabeth Oswald | [email protected]. Kawg hloov kho: 2024-01-13 00:07
Recombination tshwm sim thaum ob lub molecules ntawm DNA pauv cov khoom ntawm lawv cov caj ces nrog ib leeg. Ib qho piv txwv tseem ceeb tshaj plaws ntawm kev sib koom ua ke tshwm sim thaum lub sij hawm meiosis (tshwj xeeb, thaum lub sij hawm prophase I), thaum homologous chromosomes kab hauv khub thiab sib pauv ntu ntawm DNA.
Puas recombination tshwm sim hauv mitosis lossis meiosis?
Whereas meiotic recombination tshwm sim thaum meiosis, feem ntau mitotic recombination tej zaum tsis tshwm sim thaum lub sij hawm mitosis, tab sis thaum interphase.
Puas recombination tshwm sim hauv meiosis I lossis II?
In meiosis II, cov chromosomes no tau sib cais ntxiv mus rau tus muam chromatids. Meiosis I suav nrog kev hla lossis rov ua dua ntawm cov khoom siv caj ces ntawm chromosome khub, thaum meiosis II tsis. Qhov no tshwm sim nyob rau hauv meiosis I nyob rau hauv ib tug ntev thiab nyuaj prophase I, faib ua tsib sub-phase.
Puas recombination tshwm sim hauv mitosis?
Recombination during mitosis tshwm sim los kho ib leeg-stranded gaps thiab ob-stranded so nyob rau hauv lub DNA ob helix. Qhov tseeb, tsis muaj peev xwm ua kom muaj kev sib koom ua ke ntawm homologous, tus nqi ntawm kev hloov pauv, chromosome rearrangements, thiab DNA puas tsuaj nce.
Nyob rau theem twg recombination tshwm sim hauv meiosis?
Recombination tshwm sim Thaum the Prolonged Prophase of Meiosis I. Prophase I yog qhov ntev tshaj plaws thiab sib cav qhov tseem ceeb tshaj plaws ntawm meiosis, vimrecombination tshwm sim thaum lub caij no.
Pom zoo:
Puas yog rov tshwm sim dua lossis rov tshwm sim dua?
Reoccur thiab recur yog verbs uas qhia ib lo lus hauv paus. Thaum lawv nyob ze heev ntawm lub ntsiab lus, lawv tsis zoo ib yam. Tej yam uas yog rov tshwm sim dua thiab dhau mus, tej zaum nyob rau ib ntus. Hauv qhov sib piv, ib yam dab tsi uas rov tshwm sim tsuas yog tshwm sim dua tab sis tsis tas yuav rov ua dua.
Somatic recombination tshwm sim nyob qhov twg?
Somatic recombination tshwm sim ua ntej kev sib cuag antigen, thaum lub sij hawm B cell loj hlob nyob rau hauv cov pob txha pob txha . Ib D H thiab ib J H yog randomly spliced nrog tshem tawm tag nrho cov intervening DNA (D-J koom). Tom ntej no, ib qho random V H ntu yog spliced rau qhov rov kho DJ H ntu.
Puas hla dhau qhov tshwm sim hauv mitosis lossis meiosis?
Hauv mitosis, prophase, metaphase, anaphase thiab telophase tshwm sim ib zaug. Chromosomes condense thiab cov centrosomes pib tsim ib qho spindle thaum ntxov. Meiotic prophase kuv yog ntev npaum li cas mitotic prophase. Lub sijhawm prophase Kuv homologous chromosomes ua rau kev sib cuag nrog ib leeg hu ua chiasmata thiab "
Puas tau tshwm sim lossis tshwm sim?
Qhov kev qhia "tshwm sim" tsis tuaj yeem siv qhov khoom ncaj qha, thiab yog li ntawd nws tsis muaj daim ntawv passive, yog li tsis muaj "yog/was/be tshwm sim" tense. Puas tau tshwm sim los yog tshwm sim? Ob daim ntawv yog grammatically raug (tsis sib xws rau kev hais lus ntawm qee cov lus Askiv purists).
Puas tsis muaj qhov tshwm sim tshwm sim xav tau enzymes?
Tam sim no, enzymes TSIS ua rau cov tshuaj tiv thaiv tsis yog tus kheej. Txawm li cas los xij, enzymes ua kom nrawm nrawm ntawm cov tshuaj tiv thaiv tus kheej. Yeej, lawv ua kom cov tshuaj tiv thaiv sai dua. Enzymes ua qhov no los ntawm kev txo qis kev ua kom lub zog ntawm cov tshuaj tiv thaiv.
