Feem ntau, kev hla ntawm cov chromatids uas tsis yog tus menyuam yuav tshwm sim ntawm cov noob thaum lawv nyob deb ntawm cov homologous chromosomes thaum sib koom ua ke. … Yog li ntawd, unlinked genes tej zaum yuav nyob ntawm txawv chromosomes los yog nyob deb ntawm tib chromosome.
Puas txuas lossis tsis txuas cov noob sib txuas?
1: Txuas cov noob tuaj yeem sib cais los ntawm kev sib xyaw ua ke: Cov txheej txheem ntawm kev sib tw, lossis kev sib koom ua ke, tshwm sim thaum ob homologous chromosomes sib dhos thaum lub sij hawm meiosis thiab pauv ib ntu ntawm cov khoom siv caj ces. Ntawm no, cov alleles rau gene C tau pauv. Qhov tshwm sim yog ob recombinant thiab ob non-recombinant chromosomes.
Puas hla dhau tshwm sim thaum lub sijhawm hloov pauv noob?
Cov pab pawg ntawm cov noob caj noob ces raug xa mus rau "cov tsev neeg cov noob", vim qhov zoo ib yam ntawm lawv cov kab ke thiab lawv cov keeb kwm los ntawm qhovntsej thiaj tsis mob los ntawm cov noob caj noob ces. Kev hloov pauv tshwm sim thaum DNA rov ua dua ua ntej meiosis. Hla hla thaum metaphase I sib tov alleles los ntawm ntau homologues rau hauv kev sib txuas tshiab.
Kev hla dhau qhov tshwm sim hauv cov noob nyob qhov twg?
Kev hla dhau yog kev sib hloov ntawm cov khoom siv caj ces uas tshwm sim hauv kab kab mobThaum 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. uas zoo sib xws DNA sequences los ntawm khub chromosomes hla ib leeg.
Puas hla dhau ntawm Pachytene?
Thaum lub sijhawm meiosis, hla dhau tshwm sim ntawm theem pachytene, thaum homologous chromosomes tau ua khub tag nrho. Ntawm diplotene, thaum homologs sib cais, qhov chaw ntawm kev hla dhau los ua pom zoo li chiasmata, uas tuav ob homologs ntawm bivalent ua ke kom txog thaum sib cais ntawm anaphase I.
