Test Cross txhais li cas?
Test Cross txhais li cas?

Video: Test Cross txhais li cas?

Video: Test Cross txhais li cas?
Video: Kab tes Muaj Nyiaj thiab kab tes Txom Nyem sib txawv li cas? 2024, Kaum ib hlis
Anonim

Kev kho mob txhais ntawm xeem

: ib genetic ntoo khaub lig nruab nrab ntawm ib tug neeg homozygous recessive thiab ib tug coj xav tias heterozygote los txiav txim lub genotype ntawm tom kawg.

Yog li, dab tsi yog qhov kev sim hla hauv cov noob caj noob ces?

Hauv noob caj noob ces , a xeem hla , thawj zaug qhia los ntawm Gregor Mendel, koom nrog kev yug me nyuam ntawm ib tug neeg nrog ib tug phenotypically recessive tus neeg, nyob rau hauv thiaj li yuav txiav txim lub zygosity ntawm lub qub los ntawm kev soj ntsuam proportions ntawm cov xeeb ntxwv phenotypes. Zygosity tuaj yeem yog heterozygous lossis homozygous.

Qhov thib ob, qhov kev sim hla yog dab tsi thiab dab tsi yog tus ntoo khaub lig rov qab? Rov qab yog?kev yug me nyuam ntawm F1?hybrid nrog ib tug ntawm cov niam txiv. Kuaj? ntoo khaub lig :?Txhua? xeem ? ntoo khaub lig ?yog?backcrosses. Rov qab :? Rov qab Ntawm F1?hybrid?nrog?recessive?phenotype?can?be?considered?as?a? xeem ? ntoo khaub lig.

Kuj nug, Test Cross piav qhia qhov tseem ceeb ntawm kev xeem tus ntoo khaub lig yog dab tsi?

Xeem hla siv los xeem ib tug neeg tus genotype los ntawm hla nws nrog ib tug neeg ntawm ib tug paub genotype. Cov tib neeg uas qhia txog cov phenotype recessive yog paub tias muaj homozygous recessive genotype. Lub hom phiaj ntawm a xeem hla yog los txiav txim seb tus neeg no yog homozygous dominant los yog heterozygous.

Koj ua li cas Testcross?

Txhawm rau txheeb xyuas seb cov kab mob twg uas pom qhov tseem ceeb yog homozygous lossis heterozygous rau ib qho allele, tus kws tshawb fawb tuaj yeem ua tus ntoo khaub lig xeem . Lub cev nyob rau hauv nqe lus nug yog hla nrog ib tug kab mob uas yog homozygous rau lub recessive zoo, thiab cov xeeb ntxwv ntawm lub xeem hla raug tshuaj xyuas.

Pom zoo: