Video: Dab tsi theem ntawm meiosis ua ywj siab assortment tshwm sim?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Thaum lub sij hawm meiosis, kev ywj pheej assortment yuav ua ntej thiab tom qab ntawd hla yuav ua. Tsis yog, kev ywj pheej assortmentoccurs tom qab hla dhau. Hla dhau tshwm sim nyob rau hauv prophase Iwhile ywj siab assortment tshwm sim nyob rau hauv metaphase kuv thiab anaphase Kuv.
Tom qab ntawd, theem twg ntawm meiosis zoo tshaj plaws piav qhia txog kev ywj pheej Assortment?
Txoj cai ntawm Kev ywj pheej Assortment . Thaum lub sij hawm metaphase ntawm meiosis Kuv, synapsed khub ntawm homologouschromosomes (lub npe hu ua bivalents los yog tetrads) yog nyob rau ntawm animaginary dav hlau nyob rau hauv nruab nrab ntawm lub cell hu ua metaphaseplate. Cov chromosomes txuas nrog spindle fibers ntawm lawv cov centromeres.
Ib yam li ntawd, puas muaj kev ywj pheej nyob hauv meiosis 2? - Quora. Tsis yog, Meiosis II Nws ua haujlwm zoo ib yam li mitosis thiab muaj tib theem. Cov chromosomenumber tseem nyob haploid, thiab cov ntxhais cell yog genetically zoo tib yam rau niam txiv cell.
Tsis tas li cov lus nug yog, yuav ua li cas thiab nyob rau theem twg yog qhov kev ywj pheej ua tiav?
Thaum twg Cov hlwb sib faib thaum lub sij hawm meiosis, homologouschromosomes yog randomly faib thaum lub sij hawm anaphase I, cais thiab cais. ywj siab ntawm ib leeg. Qhov no hu ua ywj siab assortment . Nws ua rau gametes uas muaj kev sib xyaw ua ke ntawm chromosomes.
Dab tsi theem ntawm meiosis qhia txog lub hauv paus ntsiab lus ntawm kev ywj pheej assortment?
Thaum Metaphase thiab Anaphase , thaum thehomologous chromosomes kab thiab sib cais ntawm random alignmentsrelative rau ib leeg. Dab tsi yog qhov tseem ceeb ntawm Mendel's peaplant sim?
Pom zoo:
Qhov twg tshwm sim thawj lub teeb nyob ntawm qhov tshwm sim lossis lub teeb ywj pheej?
Lub Teeb-Dependent thiab Lub Teeb-Independent Reactions. Cov tshuaj tiv thaiv lub teeb, lossis cov tshuaj tiv thaiv lub teeb-dependent, yog thawj zaug. Peb hu lawv ob leeg thiab ob lub npe. Nyob rau hauv lub teeb-dependent tshwm sim ntawm photosynthesis, lub zog ntawm lub teeb propels lub electrons los ntawm ib tug photosystem mus rau lub high-zog lub xeev
Ob theem tseem ceeb ntawm photosynthesis yog dab tsi thiab txhua theem tshwm sim nyob qhov twg?
Ob theem ntawm photosynthesis: Photosynthesis yuav siv sij hawm qhov chaw nyob rau hauv ob theem: lub teeb-dependent kev tshwm sim thiab lub Calvin voj voog (lub teeb-yooj yim kev xav). Lub teeb-nyob ntawm cov tshuaj tiv thaiv, uas tshwm sim hauv thylakoid daim nyias nyias, siv lub teeb lub zog los ua ATP thiab NADPH
Ob qhov tseem ceeb ntawm lub voj voog ntawm tes yog dab tsi thiab dab tsi tshwm sim rau lub cell hauv txhua theem?
Muaj ob theem tseem ceeb hauv lub voj voog ntawm tes. Thawj theem yog interphase thaum lub cell loj hlob thiab replicates nws DNA. Qhov thib ob yog theem mitotic (M-Phase) thaum lub sijhawm cell faib thiab hloov ib daim qauv ntawm nws cov DNA mus rau ob lub hlwb zoo tib yam
Dab tsi yog qhov zoo tshaj plaws piav qhia Txoj Cai ntawm Kev ywj pheej Assortment?
Mendel txoj cai lij choj ntawm kev ywj pheej hais tias cov alleles ntawm ob (lossis ntau dua) cov noob sib txawv tau txheeb rau hauv gametes ntawm ib leeg. Hauv lwm lo lus, allele ib gamete tau txais rau ib lub noob tsis cuam tshuam rau allele tau txais rau lwm cov noob
Dab tsi yog 2 qhov tseem ceeb ntawm lub voj voog ntawm tes thiab dab tsi tshwm sim rau lub cell hauv txhua theem?
Cov xwm txheej no tuaj yeem muab faib ua ob qhov tseem ceeb: interphase (hauv nruab nrab ntawm kev sib faib theem ua pawg G1 theem, S theem, G2 theem), thaum lub xov tooj ntawm tes tsim thiab ua nrog nws cov haujlwm metabolic; mitotic theem (M mitosis), thaum lub sij hawm lub cell yog replicating nws tus kheej