Qhov Tseem Ceeb Qhov txawv - Kev sib sau ua ke vs hla hla
Cov noob tau sib xyaw thaum lub sijhawm tsim gamete lossis kev sib deev ntawm tes los ntawm meiosis. Qhov sib xyaw ntawm cov khoom siv caj ces hauv gametes hloov pauv thiab ua rau cov xeeb ntxwv qhia kev hloov pauv caj ces. Genetic recombination yog txheej txheem ntawm kev sib pauv cov khoom siv noob caj noob ces uas ua rau muaj kev sib txuas ntawm cov noob tshiab dua li kev sib txuas ntawm niam txiv. Recombination tuaj yeem tshwm sim ntawm cov chromosomes sib txawv lossis ntawm thaj chaw sib txawv ntawm tib chromosome. Chromosomes tshwm sim hauv ob pawg homologous. Thaum lub sij hawm meiosis, homologous chromosomes npaj nyob rau hauv nruab nrab ntawm lub cell thiab tsim bivalents. Cov ntsiab lus sib txuas yog hu ua chiasmata thiab chiasmata tuaj yeem pauv cov khoom siv caj ces vim hla dhau. Hla hla yog cov txheej txheem ntawm kev sib piv cov ntu ntawm chromosomes ntawm homologous chromosomes hauv thawj qhov kev faib meiosis. Nws tshwm sim thaum lub sij hawm gamete tsim, thiab nws ua rau recombinant chromosomes. Qhov sib txawv tseem ceeb ntawm kev sib koom ua ke thiab kev hla dhau yog qhov kev sib koom ua ke yog cov txheej txheem uas tsim cov noob tshiab ua ke los yog cov chromosomes recombinant thaum hla yog cov txheej txheem uas ua rau rov ua dua. Qee zaum ob lo lus no tau siv los ua cov lus.
Kev sib koom ua ke yog dab tsi?
Recombination yog xa mus rau kev sib pauv ntawm cov khoom siv caj ces thiab kev tsim cov noob tshiab ua ke. Recombination tshwm sim ntawm homologous chromosomes. Thaum kev sib pauv cov khoom siv caj ces tsis tshwm sim, qhov tshwm sim chromosomes hu ua non-recombinant chromosomes. Thaum recombination tshwm sim ntawm non-viv ncaus chromatids, qhov tshwm sim chromosomes hu ua recombinant chromosomes. Recombination yog qhov tseem ceeb vim nws yog lub luag haujlwm rau kev hloov pauv caj ces ntawm cov kab mob.
Recombinant chromosomes sib sau ua ke hauv gametes ua rau kev sib txuas ntawm cov noob tshiab hauv gametes. Nws tshwm sim thaum lub sij hawm chiasmata so. Ib ntu ntawm niam chromosome txuas rau thaj tsam sib txuam ntawm niam txiv homologous chromosome. Kev tawg ntu ntawm leej txiv chromosome txuas rau thaj tsam sib txuam ntawm niam chromosome. Cov tshiab recombined chromosomes yog tsim los ntawm crossed chromatids.
Kev hla dhau yog dab tsi?
Hla dhau yog cov txheej txheem ntawm kev sib pauv ntu ntawm chromosomes ntawm cov tsis yog tus muam chromatids thaum lub sij hawm meiosis lossis gamete tsim. Qhov no tseem hu ua homologous recombination. Raws li kev hla dhau, kev sib txuas tshiab ntawm cov noob tau tsim hauv gametes. Cov noob caj noob ces tshiab no ua rau muaj kev sib txawv ntawm caj ces ntawm cov xeeb ntxwv. Thaum lub sij hawm meiosis, homologous chromosomes ua ke nrog ib leeg thiab tsim bivalents. Non-viv ncaus chromatids poob nrog ib leeg. Lawv tsim cov ntsiab lus hu ua chiasmata. Chiasmata tsim ua kom yooj yim rau kev sib pauv cov khoom siv caj ces ntawm qhov sib txuam ntawm cov chromosomes homologous (tsis yog tus muam chromatids). Tom qab ntawd cov txiaj ntsig chromosomes hu ua recombinant chromosomes. Lawv muaj kev sib txuas ntawm cov noob tshiab piv rau cov niam txiv gene ua ke. Yog li ntawd, cov xeeb ntxwv tshwm sim txawv ntawm cov niam txiv. Thiab tseem ntawm cov xeeb ntxwv, yuav muaj kev sib txawv ntawm caj ces. Txij li thaum hla kev tshwm sim ntawm homologous chromosomes los yog txuam chromosomes, nws tsis tsim kev hloov pauv lossis ua rau muaj kab mob. Hloov chaw, nws ua rau muaj kev sib txawv ntawm caj ces uas yog qhov tseem ceeb rau kev ciaj sia thiab hloov tau ntawm cov xeeb ntxwv.
Daim duab 01: Hla Dhau
Hla dhau tuaj yeem tshwm sim hauv mitosis thiab. Thaum hla dhau qhov tshwm sim ntawm non-homologous chromosomes, nws tsim kev hloov pauv. Nws yog ib hom kev hloov pauv. Ib feem ntawm chromosome detaches los ntawm ib chromosome thiab txuas nrog non-homologous chromosome tsim kev hloov loj hauv cov noob muaj pes tsawg leeg ntawm chromosome. Yog li ntawd, cov kev hla no yog deleterious thiab tuaj yeem ua rau mob hnyav xws li mob leukemia thiab mob ntev, Duchenne leeg nqaij dystrophy, thiab lwm yam.
Dab tsi yog qhov zoo sib xws ntawm Kev Sib Koom Tes thiab Kev Hla Dhau?
- Ob qho tib si recombination thiab hla dhau tsim cov noob tshiab ua ke
- Ob yam txheej txheem tshwm sim thaum lub sij hawm meiosis.
- Ob leeg yog lub luag haujlwm rau kev sib txawv ntawm caj ces ntawm cov xeeb ntxwv.
- Ob txheej txheem xa mus rau kev sib pauv ntawm cov khoom siv caj ces ntawm homologous chromosomes.
- Kev sib sau ua ke thiab hla tuaj yeem pom thaum yug me nyuam.
Dab tsi yog qhov sib txawv ntawm kev sib koom ua ke thiab hla dhau?
Kev sib tw vs hla hla |
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| Recombination yog hais txog cov txheej txheem ntawm recombining noob los tsim cov noob tshiab ua ke uas txawv ntawm cov niam txiv. | Hla dhau yog txheej txheem ntawm kev sib pauv ntu ntawm chromosomes ntawm homologous chromosomes. |
Summary – Recombination vs Hla Hla
Recombination yog tus txheej txheem ntawm kev tsim cov noob tshiab ua ke hauv gametes uas txawv ntawm cov niam txiv. Recombination tshwm sim nyob rau hauv recombinant chromosomes. Recombinant chromosomes yog tshwm sim los ntawm kev hloov pauv caj ces hauv cov xeeb ntxwv. Hla hla yog cov txheej txheem uas ua rau recombination. Thaum homologous chromosomes tsim cross chromatids thaum lub sij hawm prophase I ntawm meiosis, genetic pauv khoom tshwm sim. Kev sib pauv ntawm nonsister chromatids ntawm homologous chromosomes nyob rau hauv tus ntoo khaub lig chromatids tsim tshiab gene ua ke, thiab nws yog hu ua hla. Qhov no yog qhov sib txawv ntawm kev sib koom ua ke thiab hla dhau.
Download PDF Recombination vs Hla Hla
Koj tuaj yeem rub tawm PDF version ntawm kab lus no thiab siv nws rau offline hom phiaj raws li daim ntawv ceeb toom. Thov download PDF version ntawm no Qhov txawv ntawm Recombination thiab Hla Hla
