Yuav ua li cas sau phenotypic piv rau dihybrid hla?

Cov txheej txheem:

Yuav ua li cas sau phenotypic piv rau dihybrid hla?
Yuav ua li cas sau phenotypic piv rau dihybrid hla?
Anonim

This 9:3:3:1 phenotypic piv yog qhov piv txwv ntawm Mendelian classic rau tus ntoo khaub lig dihybrid uas cov alleles ntawm ob hom noob sib txawv ntawm nws tus kheej rau hauv gametes. Daim duab 1: Ib qho piv txwv ntawm Mendelian classic ntawm kev ywj pheej assortment: 9: 3: 3: 1 phenotypic piv cuam tshuam nrog tus ntoo khaub lig dihybrid (BbEe × BbEe).

Koj sau qhov phenotypic piv li cas?

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

Dab tsi yog qhov piv ntawm dihybrid phenotypic ratio?

Ib tug dihybrid hla ob yam. Ob leeg niam txiv yog heterozygous, thiab ib qho allele rau txhua tus cwj pwm qhia txog kev ua tiav. Qhov no txhais tau hais tias ob leeg niam txiv muaj recessive alleles, tab sis nthuav tawm cov phenotype tseem ceeb. Tus phenotype piv kwv yees rau tus ntoo khaub lig dihybrid yog 9: 3: 3: 1.

Dab tsi yog phenotype ntawm tus ntoo khaub lig dihybrid?

Raws li hauv tus ntoo khaub lig dihybrid, F1 tiam cov nroj tsuag uas tsim los ntawm tus ntoo khaub lig monohybrid yog heterozygous thiab tsuas yog dominant phenotype yog pom. Qhov sib piv phenotypic ntawm qhov tshwm sim F2 tiam yog 3: 1. Hais txog 3/4 nthuav tawm cov phenotype tseem ceeb thiab 1/4 nthuav tawm cov phenotype recessive.

Tus piv yog dab tsintawm dihybrid test cross?

Test cross yog tus ntoo khaub lig kom paub qhov genotype ntawm tus kheej. Tus neeg raug hla nrog niam txiv recessive. Qhov kev ntsuas dihybrid hla piv yog 1: 1: 1: 1.

Pom zoo: