Video: Txhua khub ntawm homologous chromosomes muaj li cas?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Homologous chromosomes yog tsim los ntawm chromosome khub ntawm kwv yees li qhov ntev, txoj hauj lwm centromere, thiab staining qauv, rau cov noob nrog tib loci sib raug. Ib homologous chromosome tau txais los ntawm lub cev niam; lwm tus yog txais los ntawm lub cev txiv neej.
Ib yam li ntawd, tib neeg nug, qhov piv txwv ntawm homologous chromosomes yog dab tsi?
Homologous Chromosomes . Hauv diploid (2n) kab mob, cov genome yog tsim los ntawm homologous chromosomes . Hauv vaj peas, rau piv txwv , gene rau pod xim ntawm leej niam chromosome tej zaum yuav daj allele; cov gene homologous niam txiv chromosome tej zaum yuav yog ntsuab allele.
Ib yam li ntawd, puas yog homologous khub ntawm chromosomes muaj nyob rau hauv mitosis? Homologous chromosomes tsis yog muaj nyob rau hauv mitosis , theej xwb nyob rau hauv meiosis . Hauv mob mitosis koj muaj tus muam chromatids; homologous chromosomes yog cov chromosome khub , txhua tus los ntawm ib tug niam txiv.
Ib yam li ntawd, koj tuaj yeem nug, cov yam ntxwv dab tsi ua ob homologous chromosomes sib koom?
Homologous chromosomes zoo sib xws, tab sis tsis zoo ib yam. Ib tug los ntawm niam thiab ib tug los ntawm txiv. Lawv nqa cov noob rau tib tus cwj pwm qub qub, tej zaum yuav muaj ntau yam sib txawv ntawm tib lub noob. Ob homologous chromosomes qhia txoj haujlwm ntawm centromere, hom / qhov chaw ntawm cov noob, thiab ntev /puab.
Yuav ua li cas koj txheeb xyuas homologous chromosomes?
Homologous chromosomes tuaj yeem yog txheeb xyuas thaum pib ntawm meiosis. Ib tug tswv cuab ntawm txhua khub los ntawm niam txiv (niam) thiab lwm tus los ntawm txiv neej niam txiv. Niam thiab txiv chromosomes hauv a homologous khub muaj tib cov noob ntawm tib loci, tab sis tej zaum txawv alleles.
Pom zoo:
Yuav ua li cas yog tias homologous chromosomes tsis ua khub?
Aneuploidy yog tshwm sim los ntawm nondisjunction, uas tshwm sim thaum khub ntawm homologous chromosomes los yog tus muam chromatids tsis cais thaum lub sij hawm meiosis. Yog tias homologous chromosomes tsis sib cais thaum lub sij hawm meiosis I, qhov tshwm sim tsis muaj gametes nrog tus lej ib txwm (ib) ntawm chromosomes
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
Yuav ua li cas yog lub appendix homologous rau lwm yam tsiaj homologous qauv qhia li cas?
Tib neeg appendix (ib lub hnab me me nyob ze ntawm qhov sib tshuam ntawm txoj hnyuv me thiab loj) yog homologous rau cov qauv hu ua 'caecum', lub tsev loj, qhov muag tsis pom kev hauv cov nplooj thiab cov nyom tau zom hauv ntau lwm yam tsiaj. Cov ntawv ntxiv feem ntau hu ua 'vestigial' qauv
Muaj pes tsawg guanine bases puas yog 50 lub hauv paus khub ob txoj hlua DNA 100 bases tag nrho muaj yog tias nws muaj 25 adenine bases?
Yog li, muaj tag nrho ntawm 25 + 25 = 50 adenine thiab thymine hauv tag nrho. Qhov ntawd tawm 100− 50 = 50 seem hauv paus. Nco ntsoov tias cytosine thiab guanine daim ntawv cog lus nrog ib leeg, thiab yog li lawv sib npaug ntawm cov nyiaj. Tam sim no peb tuaj yeem faib los ntawm 2 kom tau txais tus lej ntawm guanine lossis cytosine hauv paus
Puas yog homologous chromosomes muaj tib lub noob?
Ib chromosome ntawm txhua homologous khub los ntawm leej niam (hu ua niam txiv chromosome) thiab ib tug los ntawm leej txiv (paternal chromsosome). Homologous chromosomes zoo sib xws tab sis tsis zoo ib yam. Txhua tus nqa tib cov noob hauv tib qho kev txiav txim, tab sis cov alleles rau txhua qhov zoo yuav tsis zoo ib yam