Qhov sib txawv tseem ceeb ntawm codominance thiab ntau alleles yog tias codominance qhia txog cov teebmeem ntawm ob leeg alleles ntawm nws tus kheej, tsis muaj kev sib xyaw hauv lub xeev heterozygous, thaum ntau alleles hais txog lub xeev ntawm tus cwj pwm uas muaj ntau tshaj ob qho sib txawv.
Feem ntau, txhua lub noob tuaj nrog ob qho sib txawv. Ib qho yog ib qho tseem ceeb ntawm allele thaum lwm tus yog cov allele recessive. Raws li Mendelian qub txeeg qub teg, tseem ceeb allele qhia nws cov phenotype thaum suppressing allele recessive nyob rau hauv lub xeev heterozygous. Txawm li cas los xij, qee cov noob muaj peb lossis ntau qhov sib txawv alleles rau ib qho zoo. Lawv hu ua ntau alleles. Ntxiv mus, codominance yog ib qho qub txeeg qub teg uas tsis yog Mendelian. Hauv qhov tshwm sim no, cov xeeb ntxwv tau txais ob qho tib si niam txiv cov noob raws li kev sib xyaw ntawm ob lub noob. Yog li ntawd, ob lub noob tau qhia sib npaug ntawm cov xeeb ntxwv.
Codominance yog dab tsi?
Codominance yog qhov qhia txog qhov cuam tshuam ntawm ob qho tib si ntawm nws tus kheej hauv ib qho phenotype. Nws yog ib hom kev sib raug zoo ntawm alleles ntawm cov noob. Tsis tas li ntawd, nws yog hom tsis yog Mendelian qub txeeg qub teg. Nyob rau hauv lub xeev heterozygous, ob qho tag nrho alleles tau qhia tag nrho thiab qhia cov nyhuv ntawm allele hauv cov xeeb ntxwv ntawm nws tus kheej. Tsis yog allele suppresses cov nyhuv ntawm lwm cov allele hauv codominance. Yog li ntawd, qhov kawg phenotype tsis yog qhov tseem ceeb thiab tsis muaj zog. Hloov chaw, nws suav nrog kev sib xyaw ntawm ob qho tib si. Ob leeg alleles manifest lub phenotype nrog nws cov nyhuv yam tsis muaj kev sib xyaw cov teebmeem ntawm tus kheej. Nyob rau hauv qhov kawg phenotype, cov teebmeem ntawm ob qho tag nrho cov alleles tuaj yeem paub meej meej thaum qhov xwm txheej codominance. Tsis tas li ntawd, tsis muaj qhov cuam tshuam ntau hauv codominance.
Daim duab 01: Codominance
ABO pawg ntshav yog ib qho piv txwv rau kev sib koom ua ke. Allele A thiab allele B yog codominant rau ib leeg. Yog li, pawg ntshav AB tsis yog A lossis B. Nws ua haujlwm raws li pawg ntshav cais vim yog kev sib koom ua ke ntawm A thiab B. Lwm qhov piv txwv classic ntawm codominance yog tabby miv. Thaum cov miv dub dawb huv thiab cov miv xim av ua ke nrog ib leeg, 1 stfilial tiam yuav muaj cov kittens (tabby miv) uas yog xim dub thiab muaj kab txaij xim av los yog me ntsis los yog vice versa. Codominance kuj tuaj yeem pom ntawm Shorthorn nyuj.
Ntau Alleles yog dab tsi?
Yog tias tus cwj pwm muaj ntau dua ob qho sib txawv, peb hu lawv ntau alleles. Hauv lwm lo lus, ntau lub alleles yog peb lossis ntau qhov sib txawv alleles uas code rau ib qho tshwj xeeb. Tib neeg ABO cov ntshav pab pawg muaj peb alleles. Lawv yog IA, IB thiab i. Peb cov alleles no tsim plaub hom phenotypes xws li pawg A, B cov ntshav, AB pawg ntshav thiab O cov ntshav. Yog li ntawd, ntau alleles tej zaum yuav muaj nyob rau ntawm cov pejxeem. Cov neeg sib txawv hauv cov pej xeem tuaj yeem muaj cov khub sib txawv ntawm cov alleles.
Daim duab 02: Ntau Alleles
Dab tsi yog qhov zoo sib xws ntawm Codominance thiab Ntau Alleles?
- Tib neeg ABO pawg ntshav muaj ntau yam alleles, thiab nws qhia txog kev sib koom ua ke.
- Multiple alleles thiab codominance tsis mloog Mendelian qub txeeg qub teg.
Qhov txawv ntawm Codominance thiab Ntau Alleles yog dab tsi?
Codominance yog qhov xwm txheej uas cov xeeb ntxwv tau txais kev sib xyaw ntawm cov yam ntxwv ntawm niam txiv cov noob, tsis hais txog cov noob tseem ceeb lossis cov noob caj noob ces. Nyob rau hauv sib piv, ntau alleles yog peb los yog ntau tshaj peb sib txawv alleles uas ib tug tshwj xeeb zoo muaj. Yog li, qhov no yog qhov sib txawv tseem ceeb ntawm codominance thiab ntau alleles.
Summary – Codominance vs Multiple Alleles
Alleles yog cov qauv sib txawv ntawm cov noob. Feem ntau, muaj ob lub alleles uas twb muaj lawm rau txhua tus noob. Qee lub sij hawm, tej zaum yuav muaj peb lossis ntau dua alleles rau ib qho zoo ntawm cov pejxeem. Peb hu qhov xwm txheej no ntau alleles. Hauv codominance, cov xeeb ntxwv tau txais kev sib xyaw ntawm cov yam ntxwv ntawm niam txiv cov noob, tsis hais txog cov tseem ceeb thiab cov noob caj noob ces. Qhov no qhia txog qhov sib txawv ntawm codominance thiab ntau alleles.
