Kev tswj tsis tiav txhais tau li cas muab piv txwv?
Kev tswj tsis tiav txhais tau li cas muab piv txwv?

Video: Kev tswj tsis tiav txhais tau li cas muab piv txwv?

Video: Kev tswj tsis tiav txhais tau li cas muab piv txwv?
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Anonim

Tsis tiav dominance txhais tau tias hais tias ib qho allele tsis yog tseem ceeb los yog recessive. Ib piv txwv yuav yog cov alleles rau cov noob uas txiav txim siab xim zoo nkauj ntawm tsob ntoo Mirabilis. Tom qab cov me nyuam loj hlob tuaj, peb yuav tsum xyuas cov txiaj ntsig thiab yog tias qee qhov liab qab, ces cov xim alleles tsis tiav. tseem ceeb.

Yog li ntawd, dab tsi yog qhov piv txwv ntawm kev tswj tsis tiav?

Thaum ib tug niam txiv nrog cov plaub hau ncaj thiab ib tug nrog cov plaub hau curly muaj ib tug me nyuam nrog wavy plaub hau, uas yog ib tug piv txwv ntawm tsis tiav dominance . Qhov muag xim feem ntau raug suav hais tias yog ib qho piv txwv ntawm tsis tiav dominance.

Tsis tas li ntawd, qhov piv txwv ntawm kev tswj hwm tag nrho yog dab tsi? Cov paj ntawm Mendel's pea cog yog ib qho piv txwv ntawm tag nrho dominance , los yog thaum twg tseem ceeb allele tag npog li recessive allele. Ntxiv rau ua tiav dominance , cov kws tshawb fawb pom tias tsis tiav kev tswj hwm , qhov twg muaj kev sib xyaw, thiab kev sib koom ua ke, qhov twg ob leeg alleles tshwm sim.

Hauv qhov no, kev tswj hwm tsis tiav txhais li cas?

Tsis tiav dominance yog ib daim ntawv ntawm cov qub txeeg qub teg nyob rau hauv uas ib tug allele rau ib tug tshwj xeeb zoo yog tsis kiag li qhia tag nrho nws cov khub allele. Qhov no ua rau muaj qhov thib peb phenotype uas qhia lub cev zoo yog kev sib txuas ntawm cov phenotypes ntawm ob qho tag nrho.

Codominance yog dab tsi thiab muab piv txwv?

Thaum ob lub alleles rau ib qho kev zoo sib npaug sib npaug nrog tsis yog recessive los yog dominant, nws tsim codominance . Piv txwv ntawm codominance suav nrog tus neeg muaj ntshav hom AB, uas txhais tau hais tias ob qho tib si A allele thiab B allele tau qhia sib npaug.

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