2024 Tus sau: Elizabeth Oswald | [email protected]. Kawg hloov kho: 2024-01-13 00:07
Ua ntej cov kab mob nkag mus rau meiosis, lawv feem ntau yog diploid, txhais tau tias lawv muaj ob daim ntawv luam ntawm txhua tus chromosome. Tom qab ntawd, ua ntej cov kab mob nkag mus rau hauv meiosis, nws duplicates nws DNA kom lub cell muaj plaub DNA luam tawm ntawm ob khub ntawm homologous chromosomes.
Yuav ua li cas rau homologous chromosomes thaum meiosis?
Thaum recombination tshwm sim thaum lub sij hawm meiosis, lub cell lub homologous chromosomes kab nyob ze heev rau ib leeg. Tom qab ntawd, DNA strand nyob rau hauv txhua chromosome so nyob rau hauv tib qhov chaw, tawm hauv ob lub dawb xaus. Txhua qhov kawg ces hla mus rau lwm qhov chromosome thiab tsim kev sib txuas hu ua chiasma.
Dab tsi yog homologous khub ntawm chromosomes hauv meiosis?
Homologs muaj tib cov noob hauv tib qhov chaw qhov chaw lawv muab cov ntsiab lus raws txhua tus chromosome uas ua rau ob peb chromosomes ua kom raug rau ib leeg ua ntej sib cais thaum lub sijhawm meiosis.
theem twg ntawm meiosis ua homologous chromosomes khub?
Thaum prophase I, homologous chromosomes khub thiab sib pauv ntu ntawm DNA. Qhov no yog hu ua recombination los yog hla dhau. Qhov no yog ua raws li metaphase I qhov twg cov khub sib txuas ntawm chromosomes sib dhos ntawm nruab nrab ntawm tes. Tom qab cov khub ntawm chromosomes raug sib raug zoo, anaphase kuv pib.
Puas yog homologous chromosomes hauv meiosis 1 lossis 2?
Homologous khub ntawm cov hlwb yog tam sim no hauv meiosis I thiab cais mus rau hauv chromosomes ua ntej meiosis II. Hauv meiosis II, cov chromosomes tau sib cais ntxiv mus rau tus muam chromatids. Meiosis kuv suav nrog kev hla lossis rov ua dua ntawm cov khoom siv caj ces ntawm cov chromosome khub, thaum meiosis II tsis.
Pom zoo:
Lub sijhawm prophase ib khub homologous ntawm chromosomes muaj?
Cov lus teb raug: Cov chromosomes homologous muaj ob chromosomes thiab plaub chromatids nyob rau theem prophase. Yuav ua li cas rau chromosomes thaum lub sij hawm prophase? Thaum lub sijhawm prophase, qhov nyuaj ntawm DNA thiab cov proteins uas muaj nyob hauv cov nucleus, hu ua chromatin, condenses.
Yuav tsum ua kom homologous chromosomes khub?
Lub homologous chromosomes nyob rau hauv lub cell yuav tsis ua khubthiab tau txais kev tshuaj ntsuam genetic recombination nrog ib leeg. Vim li cas homologous chromosomes khub? Lub homologous chromosomes nyob rau hauv lub nucleus ntawm lub cev gamete khub thaum lub sij hawm meiosis.
Lub sijhawm meiosis thaum twg kev sib tw ntawm chromosomes tshwm sim?
Thaum lub sijhawm prophase I, cov chromosomes condense thiab pom hauv lub nucleus. Vim tias txhua tus chromosome tau muab luam tawm thaum lub sijhawm the S theem uas tau tshwm sim ua ntej prophase I, txhua tus tam sim no muaj ob tus muam chromatids koom nrog ntawm centromere.
Thaum meiosis kuv cov homologous chromosomes ntawm tetrad?
Thaum lub sijhawm meiosis I, homologous chromosomes ntawm txhua khub tuaj ua ke thiab ua ib sab ntawm ib sab hauv qhov xwm txheej hu ua synapsis. Synapsis tshwm sim hauv tetrad, ib qho kev koom ua ke ntawm plaub chromatids(ob homologous chromosomes uas muaj ob chromatids txhua).
Puas yuav homologous chromosomes khub thaum meiosis?
Homologous chromosomes tsis ua haujlwm zoo ib yam hauv mitosis li lawv ua hauv meiosis. Ua ntej txhua tus mitotic faib ib lub xovtooj mus, cov chromosomes hauv niam txiv cell rov ua dua lawv tus kheej. Lub homologous chromosomes nyob rau hauv lub cell yuav ib txwm tsis ua khubthiab tau txais genetic recombination nrog ib leeg.
