Video: Dab tsi yog qhov piv ntawm kev xeem hla?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Qhov no 1:1:1:1 phenotypic piv yog qhov classic Mendelian piv rau qhov kev sim hla uas cov alleles ntawm ob lub noob sib txawv ntawm nws tus kheej rau hauv gametes (BbEe × bbee).
Tsuas yog li ntawd, ob qho piv txwv Testcross yog dab tsi?
A 1:1:1:1 piv hauv a xeem ua 9:3:3:1 piv nyob rau hauv tus kheej ntawm ib tug dihybrid ob leeg qhia txog gametic piv ntawm 1: 1: 1: 1, uas qhia tau hais tias cov khub allele tau sib txawv ntawm nws tus kheej (feem ntau vim lawv nyob ntawm cov chromosome sib txawv) thiab RF yog 50 feem pua.
Tsis tas li ntawd, koj yuav pom qhov piv ntawm tus ntoo khaub lig Dihybrid li cas? Rau xam qhov pom piv (Kem 3), faib tus naj npawb ntawm txhua cov phenotype los ntawm 21 (cov noob phenotype nrog tus lej qis tshaj). 3. Rau qhov xav tau piv (Kem 4), siv 9:3:3:1, theoretical piv rau a dihybrid ntoo khaub lig.
Ib yam li ntawd, tej zaum koj yuav nug, Monohybrid xeem cross ratio yog dab tsi?
Hauv monohybrid ntoo khaub lig , a xeem ntawm ib tug neeg heterozygous ua rau 1: 1 piv . Nrog lub dihybrid ntoo khaub lig , koj yuav tsum cia siab rau 1:1:1:1 piv !
Yuav ua li cas koj twv seb phenotypic ratios?
Sau tus nqi ntawm homozygous dominant (AA) thiab heterozygous (Aa) squares ua ib qho phenotype pab pawg. Suav tus nqi ntawm homozygous recessive (aa) squares ua lwm pab pawg. Sau qhov tshwm sim ua ib piv ntawm ob pawg. Ib tug suav ntawm 3 los ntawm ib pawg thiab 1 los ntawm lwm tus yuav muab ib piv ua 3:1.
Pom zoo:
Yuav hais li cas txog peb qhov kev xeem hla hla?
Peb-point Testcross. Hauv kev txheeb xyuas kev sib txuas, peb lub ntsiab lus testcross yog hais txog kev txheeb xyuas qhov qub txeeg qub teg ntawm 3 alleles los ntawm kev sim hla ib qho triple heterozygote nrog triple recessive homozygote. Nws ua rau peb txiav txim siab qhov kev ncua deb ntawm 3 alleles thiab qhov kev txiav txim uas lawv nyob ntawm chromosome
Dab tsi yog qhov kev sib piv ntawm kev sib piv?
Kev sib piv-kev sib piv (UNI EN ISO 5495) xav txiav txim siab seb ob yam khoom sib txawv ntawm tus cwj pwm, xws li qab zib, crispness, yellowness, thiab lwm yam. nyob rau hauv txhua rooj plaub
Dab tsi yog qhov yuam kev loj tshaj plaws yog tias Irina ntsuas qhov ntev ntawm nws lub qhov rais li 3.35 feet qhov yuam kev loj tshaj plaws yog taw?
Kev daws: Qhov yuam kev loj tshaj plaws hauv kev ntsuas ntsuas tau txhais tias yog ib nrab ntawm qhov ntsuas ntsuas
Dab tsi yuav yog qhov phenotypic thiab genotypic piv ntawm Dihybrid xeem hla?
Qhov 9: 3: 3: 1 phenotypic piv yog qhov piv txwv ntawm Mendelian classic rau tus ntoo khaub lig dihybrid uas cov alleles ntawm ob hom noob sib txawv ntawm nws tus kheej rau hauv gametes. Daim duab 1: Ib qho piv txwv classic Mendelian ntawm kev ywj pheej assortment: 9: 3: 3: 1 phenotypic piv cuam tshuam nrog tus ntoo khaub lig dihybrid (BbEe × BbEe)
Dab tsi yog qhov txawv ntawm instantaneous thiab nruab nrab ceev dab tsi yog qhov piv txwv loj tshaj ntawm kev ceev ceev?
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