Heterozygous nezinto eziphilayo homozygous

Omunye izakhiwo ezibaluleke kakhulu kwanoma iyiphi eziphilayo kuyinto ufuzo, eliwumsuka izinqubo yokuziphendukela kwemvelo le planethi, kanye nokongiwa zinhlobo ukwehluka kuso. Iyunithi kulencane ufuzo izenzo isakhi sofuzo - elementi kwesakhiwo ka molecule ye-DNA, obhekene ukudluliswa kolwazi zofuzo elihlobene ne isici esithile somzimba. Kuye ngezinga of labelwe ephezulu kanye izakhi zofuzo esikhubazayo. Isici nobuntu amayunithi evelele ikhono "ukucindezela" esikhubazayo, ukuhlinzeka nethonya juqu kwi umzimba, hhayi sivumele ukuba kubonakaliswe isizukulwane sokuqala. Nokho, kufanele kuphawulwe ukuthi kanye egcwele waphawula ukubusa akuphelele, lapho isakhi sofuzo evelele abakwazi ukucindezela ngokuphelele ukubonakaliswa superdominance esikhubazayo futhi ondle nokuboniswa elihambisana izici ifomu namandla kunomFilisti e eziphilayo homozygous. Kuye onjani allelic (ie, inomthwalo wokuthuthukisa yesibonakaliso efanayo) izakhi zofuzo elamukelayo lusuka zinhlobo umzali, ume heterozygous nezinto eziphilayo homozygous.

Incazelo zisifake homozygous

eziphilayo Homozygous - kukhona izinto eziningi zezilwane, nababili okufanayo (evelele enginayo noma esikhubazayo) isakhi sofuzo nsuku ethile. Isici esiphawulekayo isizukulwane esilandelayo abantu homozygous ukuntuleka wokuhlukaniswa izinhlamvu kanye monotony yabo. Isizathu ngokuyinhloko ukuthi genotype homozygous umzimba iqukethe uhlobo olulodwa kuphela gametes, okhethwe ngumuntu bofeleba uma kuba imfanelo evelele, futhi ovundlile lapho ebhekisela esikhubazayo. eziphilayo Heterozygous kuhluke ukuthi ziqukethe alleles ezahlukahlukene, futhi, ngokufanelekile, yakha izinhlobo ezimbili ezahlukene gametes. eziphilayo Homozygous ku alleles ezinkulu esikhubazayo kungenziwa ezikhonjiswe njengoba aa, bb, aabb, njll Ngakho, izinto eziphilayo homozygous alleles evelele, abe-AA ikhodi, BB, AABB.

amaphethini ifa

Ukuwela heterozygous eziphilayo genotypes ezimbili okungenzeka kube evamile eyabizwa ngokuthi Aa (lapho A - evelele, futhi - a sakhi sofuzo esikhubazayo), ihlinzeka kungenzeka yokuthola i okungenzeka alinganayo inhlanganisela ezine ezihlukene gametes (okufana genotype) by ukugaya nge 3: 1 phenotype. Ngaphansi genotype kulokhu kusho uchungechunge zezakhi zofuzo eziqukethe isethi diploid yeseli esithile; a phenotype - uhlelo izici zangaphakathi nezangaphandle umzimba embuzweni.

cross Dihybrid kanye nezici zayo

Cabanga ngemithetho exhunywe inqubo kokuzalela, okwakuhilela eziphilayo homozygous. Endabeni efanayo, uma kukhona ezimbili hybrid noma poligibridnoe ibhuloho, kungakhathaliseki isimo izici heritable, cleavage kwenzeka ngesikhathi isilinganiso 3: 1, futhi lo mthetho isebenza noma eliphi inani. Hybridization wabantu lesibili isizukulwane kuleli cala yakha izinhlobo ezine eziyinhloko zokuqonda le phenotypes ku isilinganiso 9: 3: 3: 1. Kuyaphawuleka ukuthi lo mthetho isebenza ngababili homologous wama-chromosomes nokuxhumana zezakhi zofuzo ezingavikelekile eyenziwa ngaphakathi.