Video: Tus naj npawb ntawm cov hlwb tsim hauv meiosis yog dab tsi?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
plaub tus ntxhais
Ib yam li ntawd, nws tau nug, hom cell twg tsim thaum kawg ntawm meiosis?
Nyob rau hauv sib piv rau mitotic division, uas yields ob tug zoo tib yam diploid ntxhais hlwb , cov kawg tshwm sim ntawm meiosis yog tus ntxhais haploid hlwb nrog chromosomal sib xyaw ua ke sib txawv ntawm cov uas muaj nyob hauv niam txiv. Hauv cov phev hlwb , plaub haploid gametes yog ua.
Dab tsi ntawm cov hlwb tsim hauv mitosis? Mitosis tsim txhua yam tsiaj thiab nroj tsuag hlwb , cov ntaub so ntswg, thiab cov kabmob tshwj tsis yog gametes (cov qe thiab cov phev). Txij li thaum mitosis tsim genetic clones ntawm niam txiv cell thaum nws faib, txhua yam tsiaj thiab nroj tsuag hlwb uas loj hlob los ntawm lub qe fertilized (zygote) yog ntau dua los yog tsawg dua genetic zoo tib yam.
Ib yam li ntawd, koj tuaj yeem nug, pes tsawg lub hlwb ua meiosis kawg?
(Saib daim duab hauv qab no, qhov twg meiosis Kuv pib nrog diploid (2n = 4) cell thiab xaus nrog ob haploid (n = 2) hlwb .) Hauv tib neeg (2n = 46), leej twg muaj 23 khub ntawm chromosomes, tus naj npawb ntawm chromosomes raug txo los ntawm ib nrab ntawm kawg ntawm meiosis kuv (n = 23).
Yuav ua li cas gametes tsim nyob rau hauv meiosis?
Meiosis tsim haploid gametes (ova lossis phev) uas muaj ib pawg ntawm 23 chromosomes. Thaum ob gametes (ib qe thiab phev) fuse, qhov tshwm sim zygote yog ib zaug ntxiv diploid, nrog leej niam thiab leej txiv txhua tus pab txhawb 23 chromosomes.
Pom zoo:
Dab tsi yog tus naj npawb ntawm chromosomes rau haploid pea cog hlwb?
Kawm nyuaj Txhais txhais Diploid 2 pawg ntawm chromosomes pes tsawg tus chromosomes rau diploid tib neeg hlwb? 46 Tus naj npawb ntawm chromosomes rau haploid pea cog hlwb yog dab tsi? 7 Tus naj npawb ntawm chromosomes rau diploid orangutan hlwb yog dab tsi? 48 Tus lej ntawm cov hlwb rau Diploid dev hlwb yog dab tsi? 78
Tus naj npawb ntawm protons hauv tooj liab yog dab tsi?
29 Tsis tas li ntawd, muaj pes tsawg protons neutrons thiab electrons muaj tooj liab? Tooj liab muaj tus lej atomic ntawm 29 , yog li nws muaj 29 proton thiab 29 electrons. Qhov hnyav atomic (tej zaum hu ua atomic mass) ntawm ib lub atom yog kwv yees los ntawm cov lej ntawm cov protons thiab cov naj npawb ntawm cov neutrons hauv lub nucleus ntawm lub atom.
Tus naj npawb ntawm valence electrons hauv txhuas yog dab tsi?
plaub Dhau li ntawm no, koj ua li cas txiav txim seb tus naj npawb ntawm valence electrons? Rau nruab nrab atoms, lub tus naj npawb ntawm valenceelectrons yog sib npaug rau cov atom lub ntsiab pawg tus lej . Pab pawg tseem ceeb tus lej rau ib lub caij tuaj yeem pom los ntawm nws cov kab hauv lub rooj zaum.
Dab tsi yog tus naj npawb ntawm subatomic hais hauv atom ntawm B11?
Tom qab ntawd tus lej loj yog tag nrho cov protons ntxiv rau neutrons. Rau boron-11 tag nrho cov no yog 11, thiab tsib ntawm cov hais yog protons, yog li 11− 5 = 6 neutrons
Dab tsi yog tus naj npawb ntawm protons hauv atom ntawm silicon nrog cov lej loj tshaj plaws?
Piv txwv li, silicon muaj 14 protons thiab 14 neutrons. Nws atomic tooj yog 14 thiab nws atomic mass yog 28. Qhov feem ntau isotope ntawm uranium muaj 92 protons thiab 146 neutrons. Nws atomic tooj yog 92 thiab nws atomic mass yog 238 (92 + 146). 2.1 Electrons, Protons, Neutrons, thiab Atoms. Element Iron Symbol Fe Number of Electrons in Txhua Plhaub Thawj 2 Thib Ob 8 Peb 14