2024 Tus sau: Elizabeth Oswald | [email protected]. Kawg hloov kho: 2024-01-13 00:07
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.
Yuav ua li cas rau homologous chromosomes thaum lub sij hawm 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.
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.
Vim li cas homologous chromosomes khub?
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.
Thaum ob homologous chromosomes kabthaum meiosis no hu ua?
Cov xwm txheej ntawm metaphase II zoo ib yam li cov mitotic metaphase - hauv ob qho tib si, cov chromosomes kab raws li lub cell's equatorial phaj, kuj hu ua metaphase phaj, hauv kev npaj. rau lawv qhov kev sib cais (Daim duab 5).
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 homologous khub ntawm chromosomes?
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.
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).
Thaum homologous chromosomes tsis cais?
1 NONDISJUNCTION Nondisjunction Nondisjunction Feem ntau ntawm cov teeb meem tshwm sim los ntawm kev tsis sib txuas thaum lub sij hawm niam txiv meiosis I. Trisomy tshwm sim nyob rau hauv tsawg kawg yog 0.3% ntawm cov menyuam mosthiab nyob rau hauv ze li ntawm 25% ntawm spontaneous rho menyuam.
