Kev hla dhau tshwm sim thaum prophase I ntawm meiosis ua ntej tetrads tau ua raws li txoj kab nruab nrab hauv metaphase I. Los ntawm meiosis II, tsuas yog viv ncaus chromatids tseem nyob thiab homologous chromosomes tau tsiv mus rau cais cov hlwb. Nco qab tias lub ntsiab lus ntawm kev hla yog ua kom muaj ntau haiv neeg.
Nyob rau theem twg ntawm meiosis crossover feem ntau tshwm sim?
Kev hla dhau tshwm sim nruab nrab ntawm prophase I thiab metaphase I thiab yog txheej txheem uas ob homologous non-viv ncaus chromatids ua ke nrog ib leeg thiab sib pauv sib txawv ntawm cov khoom siv caj ces los ua ob recombinant chromosome tus muam chromatids.
Yuav ua li cas thaum hla 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 lub chromosome tawg nyob rau hauv tib qhov chaw, tawm hauv ob qhov kawg. Txhua qhov kawg ces hla mus rau lwm qhov chromosome thiab cov ntawv kev sib txuas hu ua chiasma.
Leej twg hla dhau tshwm sim hauv meiosis?
Kev hla dhau yog kev sib pauv ntawm cov khoom siv caj ces uas tshwm sim hauv kab kab mob. Thaum lub sij hawm tsim cov qe thiab cov phev hlwb, tseem hu ua meiosis, ua ke chromosomes los ntawm txhua tus niam txiv sib haum kom cov DNA zoo sib xws los ntawm cov khub chromosomes hla ib leeg.
Lub sijhawm twg ntawm prophase kuv hla dhau qhov chaw?
Lub sijhawm twg ntawm prophase kuv hla dhau qhov chaw? Hla hla tshwm sim thaum lub sij hawm pachynema thaum bivalents sib raug zoo. Ib tug tetrad yog tsim los ntawm ib khub ntawm homologous chromosomes ntawm synapsis ntawm prophase I.
