Video: Dab tsi yog qhov piv ntawm f1 tiam?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Lub phenotypic piv yog 9:3:3:1 hos genotypic piv yog 1:2:1:2:4:2:1:2:1.
Kuj nug, qhov piv ntawm f2 tiam yog dab tsi?
9:7
Ib yam li ntawd, qhov genotypic piv ntawm Dihybrid cross hauv f1 tiam yog dab tsi? Raws li hauv a dihybrid ntoo khaub lig , cov F1 tiam Cov nroj tsuag tsim los ntawm monohybrid ntoo khaub lig yog heterozygous thiab tsuas yog tus tseem ceeb phenotype yog pom. Cov phenotypic piv ntawm qhov tshwm sim F2 tiam yog 3:1. Kwv yees li 3/4 pom qhov tseem ceeb phenotype thiab 1/4 qhia txog qhov tsis txaus phenotype.
Tsis tas li ntawd, dab tsi yog genotype ntawm f1 tiam?
Yog tias koj hla ob niam txiv uas yog 'kev yug me nyuam tiag tiag' - txhais tau tias lawv txhua tus muaj homozygous traits (ib tus muaj qhov tseem ceeb, lwm tus muaj qhov tsis zoo) - F1 tiam feem ntau yuav heterozygous (muaj ib genotype uas yog heterozygous thiab ib tug phenotype uas yog dominant).
F1 thiab f2 tiam yog dab tsi?
Niam txiv tiam (P) yog thawj pawg niam txiv hla. Cov F1 (thawj filial) tiam muaj tag nrho cov xeeb ntxwv los ntawm niam txiv. Cov F2 (thib ob filial) tiam muaj cov xeeb ntxwv los ntawm kev tso cai F1 cov neeg sib tw.
Pom zoo:
Dab tsi yog qhov txawv ntawm qhov sib txawv ntawm qhov sib txawv thiab qhov sib txawv ntawm qhov ntab?
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Dab tsi yog qhov txawv ntawm P tiam f1 tiam thiab f2 tiam?
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