Dab tsi yog qhov piv ntawm kev xeem hla?
Dab tsi yog qhov piv ntawm kev xeem hla?

Video: Dab tsi yog qhov piv ntawm kev xeem hla?

Video: Dab tsi yog qhov piv ntawm kev xeem hla?
Video: Yog Rov Tig Tau Qub Kev By Nkauj noog Hawj 2024, Kaum ib hlis
Anonim

Qhov no 1:1:1:1 phenotypic piv yog qhov classic Mendelian piv rau qhov kev sim hla uas cov alleles ntawm ob lub noob sib txawv ntawm nws tus kheej rau hauv gametes (BbEe × bbee).

Tsuas yog li ntawd, ob qho piv txwv Testcross yog dab tsi?

A 1:1:1:1 piv hauv a xeem ua 9:3:3:1 piv nyob rau hauv tus kheej ntawm ib tug dihybrid ob leeg qhia txog gametic piv ntawm 1: 1: 1: 1, uas qhia tau hais tias cov khub allele tau sib txawv ntawm nws tus kheej (feem ntau vim lawv nyob ntawm cov chromosome sib txawv) thiab RF yog 50 feem pua.

Tsis tas li ntawd, koj yuav pom qhov piv ntawm tus ntoo khaub lig Dihybrid li cas? Rau xam qhov pom piv (Kem 3), faib tus naj npawb ntawm txhua cov phenotype los ntawm 21 (cov noob phenotype nrog tus lej qis tshaj). 3. Rau qhov xav tau piv (Kem 4), siv 9:3:3:1, theoretical piv rau a dihybrid ntoo khaub lig.

Ib yam li ntawd, tej zaum koj yuav nug, Monohybrid xeem cross ratio yog dab tsi?

Hauv monohybrid ntoo khaub lig , a xeem ntawm ib tug neeg heterozygous ua rau 1: 1 piv . Nrog lub dihybrid ntoo khaub lig , koj yuav tsum cia siab rau 1:1:1:1 piv !

Yuav ua li cas koj twv seb phenotypic ratios?

Sau tus nqi ntawm homozygous dominant (AA) thiab heterozygous (Aa) squares ua ib qho phenotype pab pawg. Suav tus nqi ntawm homozygous recessive (aa) squares ua lwm pab pawg. Sau qhov tshwm sim ua ib piv ntawm ob pawg. Ib tug suav ntawm 3 los ntawm ib pawg thiab 1 los ntawm lwm tus yuav muab ib piv ua 3:1.

Pom zoo: