Dominant epistasis- Thaum qhov kev qhia ntawm ob qho tib si tseem ceeb thiab qhov tsis zoo yog npog los ntawm ib qho tseem ceeb allele los ntawm lwm qhov chaw, nws yog hu ua qhov tseem ceeb epistasis. Nws piv - 12:3:1.
Dab tsi yog qhov piv txwv tseem ceeb ntawm epistasis?
Dominant epistasis tshwm sim thaum tus tseem ceeb allele ntawm ib lub noob npog qhov kev qhia ntawm tag nrho cov alleles ntawm lwm cov noob. … Txiv txiv hmab txiv ntoo thiab paj xim hauv cov nroj tsuag yog ib qho piv txwv uas siv los piav qhia txog qhov tseem ceeb ntawm epistasis. Raws li pom hauv daim duab no, squash tuaj hauv 3 xim. Yellow (AA, Aa) yog qhov tseem ceeb tshaj ntsuab (aa).
Yuav ua li cas yog qhov piv ntawm dominant rau recessive?
Kev sim hla mus rau ib tus neeg heterozygous yuav tsum ib txwm tawm ntawm 1: 1 pivntawm qhov tseem ceeb rau cov phenotype.
Tus nqi f2 yog dab tsi nyob rau hauv cov ntaub ntawv ntawm qhov tseem ceeb epistasis?
The F2 ratio tseem zoo ib yam li 9:3:3:1. Piv txwv li: Txhua tus gene khub cuam tshuam rau tib tus cwj pwm ua tiav kev tswj hwm ntawm ob khub gene, tshiab phenotypes uas tshwm sim los ntawm kev sib cuam tshuam ntawm cov tseem ceeb, thiab kuj los ntawm kev sib cuam tshuam ntawm ob homozygous recessives.
Qhov piv ntawm F2 tiam yog dab tsi?
Qhov piv txwv phenotypic hauv F2 tiam is 3: 1 thiab genotypic piv yog 1: 2: 1. Kev xaiv A: Hauv kev ua tiav tsis tiav, tus ntoo khaub lig ntawm ob F1 hybrids ua rau kev tsim cov genotypic thiab phenotypic piv- 1: 2: 1.
