Teb: Selfing yog txheej txheem ntawm fertilization nrog polar lossis txiv neej gametes ntawm tib tus neeg. AABbCC yuav tsim ob hom gametes ABC thiab AbC. Txij li thaum, AABbCC tsuas muaj ib qho heterozygous allelic khub 'Bb', tus ntoo khaub lig yuav coj li tus ntoo khaub lig monohybrid ua rau 3: 1 phenotypic piv hauv F 2 tiam.
Tus kheej ntawm F1 tiam yog dab tsi?
Ib F1 hybrid (tseem hu ua filial 1 hybrid) yog thawj filial tiam ntawm cov xeeb ntxwv ntawm cov niam txiv sib txawv . F1 hybrids yog siv nyob rau hauv noob caj noob ces, thiab nyob rau hauv kev xaiv yug me nyuam, qhov twg lub sij hawm F1 crossbreed yuav siv tau. Lub sij hawm kuj yog qee zaum sau nrog subscript, raws li F1 hybrid.
Dab tsi yuav yog qhov phenotypic piv tau txais hauv F1 tiam yog tias tsob ntoo nrog genotype Aabbcc yog tus kheej hla?
Yog li hauv F, tiam peb genotypes yuav tau txais. Cov no yog AABBCC, AABbCC thiab AAbbCC hauv qhov piv ntawm 1: 2: 1. Phenotypically AABBCC thiab AABbCC yog tib yam. Yog li qhov phenotypic ratio hauv F, tiam yuav yog 3: 1.
Dab tsi yuav yog phenotypic ntawm cov nroj tsuag hauv F1 tiam?
Tag nrho cov nroj tsuag nyob rau hauv F1 tiam yuav siab thiab yuav muaj tib genotypes, piv txwv li tag nrho cov nroj tsuag yuav heterozygous siab. Nroj tsuag ntawm F1 tiam tau tso cai rau interbreed dawb ntawm lawv tus kheej kom tau F2 tiam. Cov nroj tsuag nyob rau hauv F2 tiam yuav siab thiab dwarf nyob rau hauv ration ntawm 3:1.
Dab tsi yog qhov piv ntawm cov nroj tsuag hauv F1 tiam?
F1 tiam tsuas muaj cov nroj tsuag siab xwb, hos F2 tiam muaj ob lub siab thiab dwarf nyob rau hauv qhov piv ntawm 3:1. Qhov tshwm sim yog vim. A) Dominance.
