Video: Nyob rau theem twg ua homologous chromosomes kab ntawm kab zauv?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Hauv metaphase Kuv, 23 khub ntawm homologous chromosomes kab raws tus kab zauv los yog metaphase phaj ntawm lub cell. Thaum lub sij hawm mitosis, 46 tus neeg chromosomes line up metaphase Txawm li cas los xij, thaum lub sij hawm meiosis kuv, 23 homologous khub ntawm chromosomes kab.
Tib neeg kuj nug, thaum lub sij hawm dab tsi ntawm meiosis ua homologous chromosomes kab ntawm txoj kab nruab nrab?
Metaphase
Qhov thib ob, puas homologous chromosomes kab hauv mitosis? Homologous chromosomes muaj nyob rau hauv ob qho tib si mob mitosis thiab meiosis , tab sis lawv tsis tsim khub hauv mob mitosis . Es lawv yuav tsim homologous chromosome khub thaum meiosis , uas tso cai rau kev hla mus tshwm sim.
Tsis tas li lo lus nug yog, dab tsi theem ua chromosomes kab raws kab zauv tsis nyob rau hauv homologous khub?
Metaphase I : Lub sijhawm metaphase I , spindle apparatus tsim los ntawm opposite xaus ntawm lub cell. Lub spindle apparatus ces xa tawm spindle fibers mus txuas rau chromosomes. Txawm li cas los xij, txij li cov chromosomes homologous yog lined ntawm ib sab rau kev hla dhau, lawv tau tuav nruj ua ke.
Lub hom phiaj ntawm meiosis yog dab tsi?
Meiosis, ntawm qhov tod tes, yog siv rau ib lub hom phiaj hauv tib neeg lub cev: kev tsim cov gametes-sex hlwb, lossis phev thiab qe . Nws lub hom phiaj yog ua kom cov menyuam ntxhais nrog ib nrab ntawm ntau chromosomes raws li lub cell pib.
Pom zoo:
Dab tsi yog qhov txawv ntawm chromosomes chromatids thiab homologous chromosomes?
Nws yog ib qho tseem ceeb kom nco ntsoov qhov sib txawv ntawm tus muam chromatids thiab homologous chromosomes. Sister chromatids yog siv nyob rau hauv cell division, zoo li nyob rau hauv lub cell hloov, whereas homologous chromosomes yog siv nyob rau hauv reproductive faib, zoo li ua ib tug neeg tshiab. Sister chromatids yog genetic tib yam
Vim li cas chromosomes nyob rau ntawm kab zauv?
Metaphase. Qhov no tseem hu ua metaphase phaj. Cov spindle fibers xyuas kom meej tias tus muam chromatids yuav sib cais thiab mus rau cov ntxhais sib txawv thaum lub cell faib. Chromosomes, uas muaj cov muam chromatids, kab nyob rau ntawm kab zauv los yog nruab nrab ntawm lub cell thaum lub sij hawm metaphase
Nws puas yuav ua rau pom qhov sib npaug ntawm kab sib npaug mus rau ib kab thiab los ntawm ib qho taw tes ntawm kab?
Qhov sib npaug ntawm ib kab uas yog parallel lossis perpendicular rau ib kab? Cov lus teb tau: Cov nqes hav ntawm cov kab sib npaug sib npaug. Hloov txoj kab nqes paub thiab cov kev sib koom ua ke ntawm ib qho taw tes ntawm lwm txoj kab rau hauv daim ntawv point-slope kom pom qhov sib npaug ntawm kab sib npaug
Yuav ua li cas los hloov ib tug quadratic kab zauv los ntawm vertex daim ntawv rau lub tshuab xam zauv?
Lub laij lej rau kev hloov pauv los ntawm daim ntawv yooj yim mus rau vertex daim ntawv y = x2 + 3x + 5. x2 + 3x + 5 = || +(p2)2-(p2)2=0. || a2+2ab+b2=(a+b)2. || -1⋅-1=+1. xS=-32=-1.5. yS=-(32)2+5=2.75
Qhov kab zauv twg sawv cev rau kab qhia ntawm daim duab Y 2x?
Slope-intercept form yog y = mx + b, qhov m yog txoj kab nqes thiab b yog y-intercept. Qhov no ua rau qhov sib npaug ntawm peb kab y = 2x + 0 lossis y = 2x