Kev hla dhau tshwm sim thaum lub sijhawm prophase I ntawm meiosis ua ntej tetrads tau ua raws li txoj kab nruab nrab hauv metaphase I Los ntawm meiosis II, tsuas yog tus muam chromatids nyob thiab homologous chromosomes tau raug tsiv mus rau cais cov hlwb.. Nco qab tias lub ntsiab lus ntawm kev hla yog ua kom muaj ntau haiv neeg.
crossover yog dab tsi thiab thaum twg nws tshwm sim?
Crossover tshwm sim thaum ob chromosomes, ib txwm muaj ob homologous ntawm tib chromosome, tawg thiab rov txuas dua tab sis mus rau qhov sib txawv kawgYog tias lawv tawg ntawm tib qhov chaw lossis chaw nyob hauv qhov sib lawv liag ntawm lub hauv paus khub, qhov tshwm sim yog kev sib pauv ntawm cov noob, hu ua genetic recombination.
Kev hla dhau qhov yuav tshwm sim nyob qhov twg?
Raws li txoj cai dav dav, yog tias ob lub noob sib nrug deb heev ntawm chromosome, nws muaj feem ntau tias kev hla yuav tshwm sim qhov nruab nrab ntawm lawv Tom qab hla dhau tshwm sim, homologous chromosomes sib cais los tsim ob tug ntxhais cell. Cov hlwb no dhau los ntawm meiosis II, thaum tus muam chromatids cais.
Vim li cas crossover tshwm sim?
Kev hla yog kwv yees tshwm sim kwv yees li tsib caug-tsib zaug hauv meiosis hauv txiv neej, thiab kwv yees li xya caum-tsib zaug hauv meiosis hauv poj niam.
Yuav ua li cas crossovers tshwm sim thaum meiosis?
Txog tam sim no peb tau xav tias kev hla dhau tshwm sim hauv 10% ntawm meiosis, tab sis qhov no tsuas yog tus lej yooj yim xwb, tsis yog txoj cai dav dav.
