Video: Gene assortment yog dab tsi?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Txoj Cai ntawm Kev ywj pheej Assortment piav qhia txawv noob ntawm nws tus kheej sib cais los ntawm ib leeg thaum cov qe ntshav tsim tawm. Kev ywj pheej assortment ntawm noob thiab lawv qhov zoo sib xws tau pom thawj zaug los ntawm Gregor Mendel hauv 1865 thaum nws kawm txog noob caj noob ces hauv peaplants.
Hauv qhov no, kev ua haujlwm ywj pheej hais txog dab tsi?
Kev txhais ntawm ywj siab assortment .: formation ntawm random ob peb ua ke ntawm chromosomes nyob rau hauv meiosis thiab cov noob ntawm txawv khub ntawm homologous chromosomes los ntawm txoj cai raws li txoj cai ntawm qhov tshwm sim ntawm ib tug ntawm txhua diploid khub ntawm homologous chromosomes rau txhua gamete ntawm nws tus kheej ntawm ib leeg.
Qhov thib ob, Mendel cov xwm txheej hu ua hnub no yog dab tsi? Mendel pom tias muaj lwm hom ntawv yam - tam sim no hu genes - uas tus account forvariations nyob rau hauv cov yam ntxwv uas tau los. Piv txwv li, cov gene forflower xim nyob rau hauv peas nroj tsuag muaj nyob rau hauv ob daim ntawv, ib tug rau ntshav thiab lwm yam rau dawb. Lwm qhov "forms" yog tam sim no hu alleles.
Kuj paub yog, qhov twg muaj kev ywj pheej assortment tshwm sim?
Teb thiab piav qhia: Kev ywj pheej assortment tshwm sim thaum Metaphase I ntawm Meiosis I. Mendel txoj cai thib ob ntawm ywj siab assortment hais tias chromosomes yuav sib haum ywj siab ntawm ib leeg, ua rau ib qho kev ywj pheej ntawm alleles.
Dab tsi yog Independent Assortment Vim li cas nws tseem ceeb?
Nws yog vim cov noob coding rau lub qhov muag xim sib cais ywj siab (thiab randomly) los ntawm cov noob coding rau cov plaub hau xim thaum tsim gametes (meiosis). Kev ywj pheej assortment ntawm cov noob yog tseem ceeb los tsim cov kev sib txuas caj ces tshiab uas ua rau muaj kev hloov pauv caj ces hauv cov neeg.
Pom zoo:
Kev ywj pheej assortment hais txog dab tsi?
Lub ntsiab lus ntawm kev ywj pheej assortment: tsim ntawm random ua ke ntawm chromosomes inmeiosis thiab cov noob ntawm cov khub sib txawv ntawm homologous chromosomes los ntawm txoj cai raws li txoj cai ntawm qhov tshwm sim ntawm ib qho ntawm ib qho ntawm txhua tus diploid khub ntawm homologous chromosomes rau txhua gameteindependently ntawm ib leeg khub
Dab tsi yog Independent Assortment hauv genetics?
Lub hauv paus ntsiab lus ntawm Independent Assortment piav qhia txog qhov sib txawv ntawm cov noob ntawm nws tus kheej sib cais ntawm ib leeg thaum cov qe menyuam loj hlob. Kev ywj pheej ntawm cov noob thiab lawv cov yam ntxwv sib xws tau pom thawj zaug los ntawm Gregor Mendel hauv 1865 thaum nws kawm txog noob caj noob ces hauv cov txiv ntoo
Dab tsi yog qhov zoo tshaj plaws piav qhia Txoj Cai ntawm Kev ywj pheej Assortment?
Mendel txoj cai lij choj ntawm kev ywj pheej hais tias cov alleles ntawm ob (lossis ntau dua) cov noob sib txawv tau txheeb rau hauv gametes ntawm ib leeg. Hauv lwm lo lus, allele ib gamete tau txais rau ib lub noob tsis cuam tshuam rau allele tau txais rau lwm cov noob
Dab tsi theem ntawm meiosis ua ywj siab assortment tshwm sim?
Thaum lub sij hawm meiosis, kev ywj pheej assortment yuav ua ntej thiab tom qab ntawd hla yuav ua. Tsis yog, kev ywj pheej assortmentoccurs tom qab hla dhau. Hla dhau tshwm sim hauv prophase Iwhile ywj siab assortment tshwm sim hauv metaphase I andanaphase I
Txoj cai lij choj ntawm Kev ywj pheej Assortment piav qhia nrog piv txwv yog dab tsi?
Txoj cai ntawm kev ywj pheej assortment yog nyob ntawm tus ntoo khaub lig dihybrid. Nws hais tias qhov qub txeeg qub teg ntawm ib tus cwj pwm yeej ib txwm muaj kev ywj pheej ntawm qhov qub txeeg qub teg ntawm lwm cov cim hauv tib tus neeg. Ib qho piv txwv zoo ntawm kev ywj pheej assortment yog Mendelian dihybrid ntoo khaub lig