Thaum kawg ntawm thawj qhov kev faib meiotic, txhua qhov thib ob spermatocyte muaj 23 chromosomes Txhua tus ntawm cov chromosomes muaj cov chromatids ua ke. Txhua tus spermatocyte thib ob ua tiav qhov kev faib meiotic thib ob yam tsis muaj kev rov ua dua ntawm DNA thiab tsim 2 spermatids txhua tus muaj 23 chromosomes.
Puas yog tus spermatocyte diploid lossis haploid?
Primary spermatocytes yog diploid (2N) hlwb. Tom qab meiosis I, ob lub spermatocytes thib ob yog tsim. Secondary spermatocytes yog haploid (N) cov hlwb uas muaj ib nrab ntawm cov chromosomes.
Puas muaj pes tsawg chromosomes nyob rau hauv tib neeg thib ob spermatocyte?
Txhua tus spermatocytes thawj zaug mus txog thawj qhov kev faib meiotic, meiosis I, los tsim ob lub spermatocytes thib ob, txhua tus muaj 23 chromosomes (haploid). Tsuas yog ua ntej qhov kev faib tawm no, cov khoom siv caj ces tau rov ua dua kom txhua tus chromosome muaj ob txoj hlua, hu ua chromatids, uas tau koom nrog los ntawm centromere.
Puas muaj pes tsawg phev tsim nyob rau hauv theem nrab spermatocyte?
Yog li txhua tus spermatocyte thib ob ua rau muaj ob lub spermatids uas tau hloov pauv los ua ob lub phev. Zuag qhia tag nrho, ob qho tib si spermatocytes theem nrab tau nce mus rau plaub sperms.
Kev ua haujlwm ntawm cov spermatocyte theem nrab yog dab tsi?
Secondary spermatocytes nyob hauv Meiosis 2, theem ntawm kev faib tshwj xeeb uas DNA txo qis mus rau ib nrab. Precursor cells tau dormant nyob rau hauv tus txiv neej txij li thaum ua ntej yug los, tab sis txav mus rau hauv cov phev tsim los ntawm cov tshuaj hormones ntawm puberty.
