Video: Dab tsi yuav yog qhov phenotypic thiab genotypic piv ntawm Dihybrid xeem hla?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
9:3:3:1 ua phenotypic piv yog lub classic Mendelian piv rau a dihybrid ntoo khaub lig nyob rau hauv uas cov alleles ntawm ob lub noob sib txawv assort nws tus kheej rau hauv gametes. Daim duab 1: Ib tug classic Mendelian piv txwv ntawm kev ywj pheej assortment: lub 9: 3: 3: 1 phenotypic piv txuam nrog a dihybrid ntoo khaub lig (BbEe × BbEe).
Kuj nug, dab tsi yog qhov phenotypic thiab genotypic piv ntawm Dihybrid cross?
Cov kev cai ntawm meiosis, raws li lawv siv rau lub dihybrid , yog codified nyob rau hauv Mendel thawj txoj cai lij choj thiab Mendel txoj cai thib ob, uas tseem hu ua Txoj Cai ntawm Segregation thiab Txoj Cai ntawm Kev ywj pheej Assortment, feem. Cov genotypic ratios yog: RRYY 1: RRYY 2: RRyy 1: RrYY 2: RrYy 4: Rryy 2: rrYY 1: rrYy 2: rryy 1.
Ib yam li ntawd, qhov genotypic thiab phenotypic piv ntawm Monohybrid test cross yog dab tsi? Ua ntej ntoo khaub lig Tag nrho cov zygotes tau txais ib qho R allele (los ntawm cov noob txiv ntoo puag ncig) thiab ib qho r allele (los ntawm niam txiv wrinkled). Vim tias R allele yog qhov tseem ceeb rau r allele, lub phenotype ntawm tag nrho cov noob yog puag ncig. Cov phenotypic piv hauv qhov no Monohybrid ntoo khaub lig yog 1:1:1.
Kuj tseem paub yog, hom ntoo khaub lig ua rau 1 1 1 1 phenotypic piv?
Nco ntsoov cov ntaub ntawv ntawm recessives yog tias koj tsis nco qab lwm yam. Los ntawm kev paub txog qhov recessive, koj cia li paub ob qho tib si phenotype thiab genotype. Hauv monohybrid tus ntoo khaub lig, ib qho kev sib tw ntawm ib tus neeg heterozygous ua rau qhov sib piv 1: 1. Nrog rau tus ntoo khaub lig dihybrid, koj yuav tsum xav txog 1: 1: 1: 1 piv!
Dab tsi yog genotype ntawm Dihybrid ntoo khaub lig?
dihybrid ntoo khaub lig . A dihybrid ntoo khaub lig piav qhia txog kev sib tw mating ntawm ob yam kab mob uas zoo ib yam hybrid rau ob yam. Cov xeeb ntxwv ntawm RRYY x rryy ntoo khaub lig , uas yog hu ua F1 tiam, yog tag nrho cov heterozygous nroj tsuag nrog puag ncig, daj noob thiab cov genotype RrYY.
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