Mendel tau saib dab tsi hauv cov xeeb ntxwv f2?
Mendel tau saib dab tsi hauv cov xeeb ntxwv f2?

Video: Mendel tau saib dab tsi hauv cov xeeb ntxwv f2?

Video: Mendel tau saib dab tsi hauv cov xeeb ntxwv f2?
Video: yuav tau tsim kho tus kheej lub neej thiaj yuav vam meej tau 2024, Kaum ib hlis
Anonim

Qhov no puas pab tau?

Yog · Tsis yog

Ib yam li ntawd, koj tuaj yeem nug, P f1 thiab f2 tiam yog dab tsi?

Piav qhov P , F1, thiab F2 tiam . P txhais tias niam txiv tiam thiab lawv tsuas yog cov nroj tsuag ntshiab xwb, F1 txhais tau tias ua ntej tiam thiab lawv yog tag nrho cov hybrids uas qhia txog tus cwj pwm tseem ceeb, thiab F2 txhais tias thib ob tiam , uas yog cov xeeb ntxwv ntawm P.

Kuj Paub, koj hla f2 tiam li cas? Rau qhov F2 tiam , peb ntoo khaub lig - yug ob tug kwv tij heterozygous. Faib heterozygous alleles nyob rau sab saum toj thiab sab axes ntawm koj Punnett square thiab tom qab ntawd, zoo li ua ntej, faib ib qho allele los ntawm txhua tus niam txiv rau txhua tus xeeb ntxwv.

Kuj nug, qhov tshwm sim ntawm f2 tiam yog dab tsi?

Cov F2 tiam tau los ntawm Nws tus kheej pollination ntawm F1 nroj tsuag, thiab muaj 75% paj liab thiab 25% paj dawb.

Yuav ua li cas tshwm sim thaum Mendel hla cov noob qoob loo?

Tag nrho cov peas ntawm no F1 tiam muaj RR genotype. Tag nrho cov phev haploid thiab qe tsim los ntawm meiosis tau txais ib chromosome 7. Tag nrho cov zygotes tau txais ib qho R allele (los ntawm cov puag ncig niam txiv) thiab ib tug r allele (los ntawm niam txiv wrinkled). Vim lub puag ncig qhov zoo yog dominant, phenotype ntawm tag nrho cov noob yog puag ncig.

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