Kodominirovanie - qhov no yog ib qho txawv hom ntawm kev sis raug zoo ntawm alleles

Yuav kom to taub li cas yog kodominirovanie nyob rau hauv noob caj noob ces, peb tsom xam cov tau hom kev sis raug zoo ntawm alleles. Raws li cov kev xav gametes purity npaj Gregor Mendel, tus tsim ntawm gametes nyob rau hauv nws pheej tsis tshua mus cia li ib tug ntawm ob alleles ntawm txhua tus niam txiv kab lub luag hauj lwm rau cov kev zoo losis phem. Yog li, nyob rau hauv ib txwm diploid gamete tsim teeb ntawm alleles. Ntxiv mus, tag nrho domination yuav manifest nws tus kheej nyob rau hauv lub sis thaum hom suppress recessive, tsis tiav dominance thiab kodominirovanie.

tsis tiav dominance

Nyob rau hauv rooj plaub no tus tseem ceeb allele yog tsis tau kiag li suppresses recessive, qhov tshwm sim yog ib tug tshiab intermediate feature. Ib tug nto moo piv txwv yog tsis tiav dominance paj xim ntawm ib co paj xws li cosmos. Piv txwv muaj yog ib tug liab paj homozygous genotype (AA) (ntshiab kab) thiab koj lub paj dawb (aa), tib ntshiab kab. Thaum lawv hla tshwm sim paj nrog cov liab coloring - piv txwv li kodominirovaniya. Lawv genotype AA muaj rau hauv daim, tab sis kuj tseem ceeb thiab recessive allele tshwm sim. By hla muab ntawm - liab xim.

Kodominirovanie

Lwm hom noob qhia - kodominirovanie. Qhov no tshwm sim yog zoo li tsis tau ua tiav dominance, tab sis tseem muaj ib tug loj sib txawv. Kodominirovanie - noob sis nyob rau hauv uas opposite cim tshwm sim ib txhij, tab sis tsis sib tov thiab tsis tsim ib nrab feature.

Thaum hla tus dawb paj nrog liab petunias yuav tig liab, liab, dawb los yog lis-xim. Paj nrog liab thiab dawb kab txaij yog ib tug ntawm ib tug txheej txheem xws li kodominirovanie. Nws yog feem ntau cov piv txwv ntawm xws li ib sis.

Kodominirovanie cov yam ntxwv ntawm lwm yam nroj tsuag.

Sis nonallelic noob

Nws yog hais tias tsuas yog tus allelic noob thov tswv yim xws li lub teb dominance, tsis tiav dominance thiab kodominirovanie. Piv txwv thiab heev heev thwmsim tau paub tseeb hais tias hais tias nyob rau hauv cov ntaub ntawv uas tsis yog-allelic noob xa mus rau lwm hom ntawm cov kev sib tshuam - kev koom tes, epistasis, complementarity polymer. Ib qho piv txwv yog lub polymer, es ua tsis tiav dominance, yog qub txeeg qub teg ntawm ib tug neeg xim nqaij tawv.

Kodominirovanie nyob rau hauv tib neeg

Lwm yam yooj yim tab sis piv txwv kodominirovaniya - qub txeeg qub teg ntawm cov ntshav pab pawg. Raws li koj paub, muaj plaub ntshav pab pawg. Cov thawj pab pawg neeg G (I) yog muaj nyob rau hauv lub xub ntiag ntawm ob genotype homozygous recessive noob O. Ib tug thib ob pab pawg neeg (II) tej zaum yuav tshwm sim thiab nrog genotype AB los yog AA. Lub phenotype li yuav tsuas qhia A hom noob, uas tag suppresses ib recessive noob. Ib tug zoo xws li cov teeb meem no yuav tsum yog rau lub thib peb ntshav pab pawg neeg B (III), uas yog tsim nrog genotype BB los yog ib tug VO. Hom noob nyob rau hauv ib tug recessive noob suppresses O thiab manifest nws tus kheej raws li ib tug tshwm sim ntawm tag nrho dominance. Tab sis yuav ua li cas thaum hla nrog homozygous genotypes AA thiab BB? Thiab cov noob A thiab B noob yog tseem ceeb, yog li tsis muaj leej twg uas lawv yuav tsis tau kiag li suppress lub lwm yam, thiab yuav manifest lawv tus kheej. Nyob rau hauv cov ntaub ntawv no, nrog rau 100% ntau yuav plaub ntshav pab pawg neeg - AB tuas kodominirovanie. Qhov no tshwm sim nyob rau hauv lub hla heterozygous AO thiab NPAWG, qhov twg tej no tau:

P: AOhVO;

F1: AO (II), AB (IV), VO (III), PA (I).

Uas yog vim li cas tus me nyuam cov ntshav pab pawg neeg yuav tsis tib yam ntshav pab pawg neeg ntawm cov niam txiv. Cov piv txwv qhia tau hais tias kodominirovanie yog manifested tsis tsuas nyob rau hauv cov xim ntawm cov nroj tsuag.

Kodominorovanie thiab hloov

Nws yog stipulated hais tias cov kev qhia ntawm ob muab - qhov no yog tsis ib txwm kodominirovanie. Qhov no qhia tau ib tug tsawg caj feature raws li tib neeg thiab tej tsiaj - heterochromia (xim mismatch iris). Heterochromia tiav, piv txwv li, thaum ib tug xim av lub qhov muag thiab ib tug xiav, los yog ib nrab, rau Piv txwv li thaum lub plhaub ntsuab muaj ib tug grey ya. Heterochromia, dua li cov khees analogy nrog rau xim painting, ib qho piv txwv tsis kodominirovaniya thiab genomic change. Kev ua txhaum ntawm daim tawv nqaij pigmentation - kuj kodominirovanie dab tsi noob caj noob ces hais tias. Kodominirovanie nyob rau hauv cov ntaub ntawv no tsis meej pem nrog tus kab mob.

Kodominirovanie tus thawj txoj kev cai Mendel

Kodominirovaniya phenomenon thiab tsis tag dominance, thaum xub thawj siab ib muag, hais tias tus thawj txoj cai ntawm Mendel rau lub uniformity ntawm hybrids yog tsis tau. Gregor Mendel nyob rau hauv nws thwmsim dealt nrog taum mog, uas tsis yuav tej kodominirovanie los yog ib nrab dominance, thiab tsuas yog ua kom tiav dominance. Nyob rau hauv tus neeg mob qhov twg ib tug tov kos npe rau, los yog cov simultaneous zaub ntawm tsis yooj yim sua, tus hais yog kiag li txoj cai. Tom qab yuav luag ib xyoo pua, thaum lawv soj ntsuam thiab kodominirovanie thiab tsis tag dominance, thawj txoj kev cai twb hloov mus rau lub xeev uas lub thib ob tiam ntawm hybrids tshwm sim, nyob rau hauv lub hauv paus ntawm zoo tib yam homozygotes los ntawm hla tus thawj tiam hybrids nrog opposite tej yam tshwm sim. Nws zoo nkaus li tseem ceeb nyob rau hauv cov ntaub ntawv ntawm ua kom tiav dominance los yog mixed kos npe rau - nyob rau hauv cov ntaub ntawv ntawm tsis tiav dominance.

Koj siv tau cov piv txwv ntawm cov qub txeeg qub teg ntawm cov ntshav pab pawg qhia qhov tseeb complement ntawm thawj txoj kev cai Mendel:

P: AA BB ×;

F1: AB, AB, AB, AB.

Cov tshwm sim ntawm hla ob kab yuav heterozygous ntshiab tshem me me, nyob rau hauv uas ib tug tov phenotype manifested kos npe rau, raws li tshwm sim kodominirovanie. Qhov no sau raws nkaus Ii ib qho kev hloov.