2024 Tus sau: Elizabeth Oswald | [email protected]. Kawg hloov kho: 2024-01-13 00:07
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.
Pom zoo:
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.
Lub sijhawm sib txawv ntawm kev cuam tshuam tuaj yeem tshwm sim ntawm?
Kev cuam tshuam tshwm sim tshwm sim thaum theem sib txawv ntawm cov nthwv dej yog ntau yam ntawm 2π, qhov kev cuam tshuam cuam tshuam tshwm sim thaum qhov sib txawv yog π, 3π, 5π, thiab lwm yam. kev cuam tshuam tsim nyog tshwm sim nyob qhov twg?
Lub sijhawm microsporogenesis meiosis tshwm sim hauv?
Teb tiav: Thaum lub sijhawm microsporogenesis, meiosis tshwm sim hauv microspore niam hlwb. Thaum lub anther tseem hluas, ib pab pawg ntawm cov kab mob sib xyaw ua ke nyob hauv nruab nrab ntawm txhua microsporangium. Cov hlwb hauv nruab nrab no tso rau hauv microsporangium tsim cov 'sporogenous cov ntaub so ntswg'.
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 yog cov hla hla hla hla hla hla hla tebchaws?
Ib qho hla hla (hu ua kev hla hla lossis hla hla hauv tebchaws Askiv thiab qee lub tebchaws Tebchaws Meskas) yog tus choj, txoj kev, tsheb ciav hlau lossis cov qauv zoo sib xws uas hla hla lwm txoj kev lossis kev tsheb ciav hlau. Ib qho overpass thiab underpass ua ke ua ib qho kev sib cais.
