Lub sijhawm prophase, qhov nyuaj ntawm DNA thiab cov proteins uas muaj nyob hauv cov nucleus, hu ua chromatin, condenses. Cov chromatin coils thiab dhau los ua compact, ua rau tsim cov chromosomes pom. Chromosomes yog tsim los ntawm ib qho DNA uas muaj kev sib koom siab heev.
Dab tsi condenses los ua chromosomes?
Hauv cov hlwb, chromatin feem ntau folds rau hauv cov yam ntxwv tsim hu ua chromosomes. … Chromatin condensation pib thaum lub sij hawm prophase (2) thiab chromosomes pom. Chromosomes tseem condensed thoob plaws hauv ntau theem ntawm mitosis (2-5).
Dab tsi condenses thaum pib ntawm mitosis?
Thaum pib ntawm mitosis, cov chromosomes condense, cov nucleolus ploj mus, thiab lub hnab ntawv nuclear tawg, ua rau tso tawm feem ntau ntawm cov ntsiab lus ntawm nucleus mus rau hauv cytoplasm.
Dab tsi ua rau chromatin condense?
Cov condensation ntawm chromatin yog tus cwj pwm los ntawm txo qhov ntim vim yog lub koom haum spatial rau hauv cov txheej txheem ntim ntau dua (8). Kev hloov kho histone tshwj xeeb, piv txwv li, histone H1 thiab H3 phosphorylation, tshwm sim ntawm mitosis thiab pab txhawb rau tus kheej thiab condensation ntawm chromosomes.
tib neeg muaj pes tsawg chromosomes?
Hauv tib neeg, txhua lub xov tooj ib txwm muaj 23 khub ntawm chromosomes, rau tag nrho ntawm 46. Nees nkaum ob ntawm cov khub no, hu ua autosomes, zoo ib yam ntawm cov txiv neej thiab poj niam. Tus khub thib 23, qhov sib deev chromosomes, txawv ntawm txiv neej thiab poj niam.
