2024 Tus sau: Elizabeth Oswald | [email protected]. Kawg hloov kho: 2024-01-13 00:07
Lub chiasmata tau pom thaum the diplotene theem ntawm prophase Intawm meiosis, tab sis qhov tseeb "hloov-overs" ntawm cov khoom siv caj ces tau xav tias yuav tshwm sim thaum lub sijhawm pachytene dhau los.
Chiasmata nyob qhov twg?
Chiasmata yog cov qauv tshwj xeeb chromatin uas txuas homologous chromosomes ua ke kom txog thaum anaphase I (Fig. 45.1 thiab 45.10). Lawv tsim ntawm qhov chaw uas programmed DNA tawg tsim los ntawm Spo11 tau dhau los ua txoj hauv kev rov ua dua tshiab los tsim kev sib tw.
Tam sim no ntawm Terminalisation puas chiasmata tshwm sim?
The chiasma theem tshwm sim thaum the diplotene theem ntawm Prophase I. Nws yog theem plaub tom qab leptotene, zygotene, thiab pachytene. Yog li, cov lus teb raug yog kev xaiv C. Lus Cim: Kev tsim chiasma ua rau kev hloov pauv ntawm cov khoom siv caj ces ntawm ob ntu ntawm cov tsis yog tus muam chromatids uas ua rau muaj kev hloov pauv.
Chiasmata hauv meiosis yog dab tsi?
Abstract. Lub chiasma yog tus qauv uas tsim ntawm ib khub ntawm homologous chromosomes los ntawm crossover recombination thiab lub cev txuas cov homologous chromosomes thaum lub sij hawm meiosis.
nyob rau theem twg ntawm prophase 1 ntawm meiosis 1 peb tuaj yeem pom chiasmata tsim?
Diakinesis . Diakinesis yog theem kawg ntawm Prophase 1 thiab yog qhov kev txiav tawm ntawm cov condensing ntawm chromosomes, qhov no tso cai rau chiasmata thiabCov qauv bivalent kom pom meej dua nyob rau hauv lub tshuab hluav taws xob electron. Cov chromosomes nyob ntawm lawv daim ntawv condensed tshaj plaws thaum lub sij hawm diakinesis.
Pom zoo:
Nyob rau theem twg ntawm erythropoiesis hemoglobin tshwm sim?
Thaum kev loj hlob, hemoglobin tshwm nyob rau hauv lub cell, thiab lub nucleus ua zuj zus me me. Tom qab ob peb hnub, lub cell poob nws cov nucleus thiab tom qab ntawd nkag mus rau hauv cov hlab ntsha hauv cov hlab ntsha ntawm cov hlab ntsws.
Leej twg nyob rau theem siab tshaj ntawm kev xav tsis thoob?
Stetson Wright Txuas ntxiv rau kev xav tsis thoob: Friday's 92 yog qhov qhab nia siab tshaj plaws. Puas muaj pes tsawg qib uas xav tsis thoob? Ninety theem tau kis thoob peb lub ntsiab lus pom, tab sis qhov sib txawv ntawm lawv tsawg thiab tsis muaj txiaj ntsig txaus rau kev ua si.
Yuav ua li cas txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau pom kev pom?
Txawm li cas los xij, corneal collagen cross-linking - cov txheej txheem qib siab tau pom zoo los ntawm US Food and Drug Administration (FDA) hauv xyoo 2016 - tuaj yeem txhim kho qhov pom kev hauv cov neeg mob txhua hnub nyoog. Corneal collagen cross-linking (CXL) tsis yog kho rau keratoconus, tab sis nws tuaj yeem pab tiv thaiv tus mob kom tsis txhob mob hnyav.
Ntawm qhov capillaries pom nyob rau hauv lub cev nyob qhov twg?
Nruam: Cov capillaries no tsis muaj perforations thiab cia tsuas yog me me molecules dhau mus. Lawv tam sim no hauv nqaij, tawv nqaij, rog, thiab paj hlwb. Fenestrated: Cov capillaries no muaj cov pores me me uas tso cai rau cov molecules me los ntawm thiab nyob hauv cov hnyuv, ob lub raum, thiab cov qog endocrine.
Lub sijhawm twg theem ntawm meiosis ua alleles cais?
Alleles cais ntawm ib leeg thaum anaphase ntawm meiosis I, thaum homologous khub ntawm chromosomes sib cais. theem ntawm meiosis Puas muaj kev sib cais ntawm alleles tshwm sim? Chromosome segregation tshwm sim ntawm ob theem sib cais thaum lub sij hawm meiosis hu ua anaphase I thiab anaphase II (saib daim duab meiosis).
