Heterozygous thiab homozygous kab mob

Ib tug ntawm cov tseem ceeb tshaj plaws thaj chaw ntawm tej sia yog caj, lwm evolutionary dab ntawm cov ntiaj chaw, raws li zoo raws li txoj kev txuag ntawm hom ntau haiv rau nws. Tus me tshaj unit ntawm caj ua noob - ntxwv caij ntawm lub DNA molecule, lub luag hauj lwm rau cov kev hloov ntawm kev tshuaj ntsuam genetic ntaub ntawv txuam nrog ib tug kev feature ntawm lub cev. Nyob ntawm seb cov neeg kawm ntawv ntawm faib hom thiab recessive noob. Ib tug yam ntxwv feature ntawm hom units yog lub peev xwm rau "suppress" recessive, muab ib tug decisive cawv rau tus kab mob, tsis tas lawv yuav tsum tau manifested nyob rau hauv thawj tiam. Txawm li cas los, nws yuav tsum tau muab sau tseg uas nrog rau tag nrho cov cai tsis tiav dominance, nyob rau hauv uas lub hom noob tsis tau kiag li suppress qhia ntawm recessive superdominance thiab muab rau zaub ntawm cov coj nta nyob rau hauv daim ntawv muaj zog tshaj nyob rau hauv homozygous kab mob. Nyob ntawm seb dab tsi zoo ntawm allelic (ie, lub luag hauj lwm rau txoj kev loj hlob ntawm lub tib lub kos npe rau) noob nws tau txais los ntawm niam txiv hom, sawv heterozygous thiab homozygous kab mob.

Ntsiab Txhais ntawm Kev homozygous kab mob

Homozygous kab mob - yog khoom ntawm cov tsiaj qus, nrog rau ob tug ntawm cov tib yam (hom los yog recessive) noob rau ib tug hauv paus. Ib tug txawv feature ntawm cov tiam tom ntej ntawm homozygous neeg yog ib tug tsis muaj segregation ntawm cov cim thiab lawv monotony. Yog vim li cas mas yog hais tias tus homozygous genotype ntawm tus kab mob muaj tsuas yog ib hom ntawm gametes, xaiv los ntawm ib tug capital tsab ntawv nyob rau hauv rooj plaub no nws yog ib tug tseem ceeb kev zoo losis phem, thiab kab rov tav thaum xa recessive. Heterozygous kab mob txawv nyob rau hauv uas lawv muaj sib txawv alleles, thiab, raws li, tsim ob ntau hom kev gametes. Homozygous kab mob nyob rau hauv loj recessive alleles yuav denoted li ib tug ib tug, bb, aabb, etc. Raws li, homozygous kab mob tseem ceeb alleles, muaj ib tug code AA, BB, AABB.

qauv ntawm qub txeeg qub teg

Hla ob heterozygous kab mob genotypes uas tej zaum yuav conventionally xws li ib tug ib tug (nyob rau A - hom, thiab - ib tug recessive noob), nws muab tau muab vaj huam sib luag muaj tseeb plaub txawv ob peb ua ke ntawm gametes (variant genotype) los ntawm kev zom nrog 3: 1 phenotype. Nyob rau hauv genotype nyob rau hauv cov ntaub ntawv no txhais tau tias ib tug series ntawm cov noob uas muaj ib tug diploid txheej ntawm ib tug cell; ib tug phenotype - ib tug system ntawm sab nraud thiab sab hauv nta ntawm tus kab mob nyob rau hauv nqe lus nug.

Dihybrid ntoo khaub lig thiab nws cov nta

Xav txog cov kev cai kev cob cog rua nrog lub mating txheej txheem, uas muab kev koom tes homozygous kab mob. Nyob rau hauv tib cov ntaub ntawv, yog hais tias muaj yog ib tug ob-hybrid los yog poligibridnoe hla, tsis hais txog qhov heritable sijhawm, cleavage tshwm sim nyob rau hauv ib qho ratio ntawm 3: 1, thiab txoj kev cai no yog siv tau rau tej nuj nqis. Hybridization ntawm lub thib ob-tiam neeg nyob rau hauv cov ntaub ntawv no tas plaub lub ntsiab hom phenotypes nyob rau hauv tus piv 9: 3: 3: 1. Nws yog ib nqi sau cia hais tias txoj kev cai no yog siv tau rau cov homologous officers ntawm chromosomes sis ntawm noob uas yog tsis nqa tawm sab hauv.