Qhov sib txawv tseem ceeb ntawm qhov tseem ceeb thiab qhov tsis zoo yog qhov tseem ceeb ntawm cov alleles yog cov alleles uas muab cov phenotype, npog dua lwm cov phenotype, thaum cov alleles recessive yog cov alleles uas yog suppressed los ntawm dominant allele.
Feem ntau, ib chromosome muaj ntau cov noob, thiab lawv muaj nyob rau hauv ib qho chaw. Yog tias cov noob muaj nyob hauv tib qhov chaw hauv homologous chromosomes, lawv tau hais tias muaj tib qhov chaw. Txij li thaum lawv muaj nyob rau hauv tib loci ntawm leej niam thiab txiv chromosome, cov noob no muaj qhov zoo ib yam. Lawv yog lwm hom ntawm cov noob; peb hu cov alleles. Alleles tuaj yeem ua tau zoo lossis rov ua dua. Ib qho tseem ceeb allele ib txwm muab cov phenotype nws codes thaum lub recessive allele muab phenotype tsuas yog thaum nws nyob hauv lub xeev homozygous. Qhov tseeb tiag, kev dominance thiab recessivity yog phenotypic correlation ntawm ob alleles.
Dominant Alleles yog dab tsi?
Tus tseem ceeb allele yog qhov muaj zog tshaj plaws ntawm ob hom ntawm cov noob muaj nyob rau hauv tib loci ntawm leej niam thiab txiv chromosome. Qhov zoo ntawm cov tseem ceeb allele yog ib txwm qhia thaum cov noob tshwm sim hauv ob homozygous dominant thiab heterozygous xeev.
Daim duab 01: Dominant thiab Recessive Alleles
Piv txwv li, yog tias peb xav txog qhov tseem ceeb ntawm allele li (A) thiab recessive allele li (a), ces nyob rau hauv rooj plaub ntawm homozygous, peb tuaj yeem sau ob qho alleles li AA. Nyob rau hauv cov ntaub ntawv ntawm heterozygous, peb tuaj yeem sau nws li Aa. Hauv ob qho xwm txheej, tus tseem ceeb allele tuaj yeem nthuav qhia nws cov phenotype tshaj li recessive allele. Yog li, qhov tseem ceeb ntawm allele npog qhov phenotype ntawm recessive allele.
Dab tsi yog Recessive Alleles?
Cov allele recessive yog cov tsis muaj zog allele ntawm ob alleles ntawm ib tug noob. Nws tsuas yog qhia nyob rau hauv cov ntaub ntawv ntawm homozygous. Nyob rau hauv cov ntaub ntawv ntawm heterozygous, lub dominant allele npog lub phenotype ntawm recessive allele. Piv txwv li, yog tias peb xav txog qhov tseem ceeb ntawm allele li (A) thiab recessive allele li (a), qhov recessive allele tuaj yeem qhia nws qhov phenotype nkaus xwb nyob rau hauv rooj plaub ntawm 'aa'. Yog li, nws tsis tau qhia hauv nws lub xeev Aa vim yog cov txiaj ntsig ntawm cov tseem ceeb allele.
Dab tsi yog qhov zoo sib xws ntawm Dominant thiab Recessive Alleles?
- Dominant thiab recessive alleles yog ob hom ntawm cov noob.
- Ob leeg encode rau qhov zoo.
- Kuj, ob leeg nyob ntawm tib qhov chaw.
- Tsis tas li ntawd, thaum lawv nyob hauv lub xeev homozygous, lawv muab lawv cov phenotypes.
Qhov txawv ntawm Dominant thiab Recessive Alleles yog dab tsi?
Dominant allele yog qhov muaj zog allele los ntawm ob qho alleles, thiab qhov tsis muaj zog yog qhov tsis muaj zog. Ib qho tseem ceeb allele tuaj yeem nthuav qhia nws cov phenotype nyob rau hauv ob qho tib si nws heterozygous thiab homozygous xeev, tab sis ib qho allele recessive tuaj yeem qhia nws cov phenotype nkaus xwb hauv nws lub xeev homozygous lossis thaum tsis muaj allele. Yog li, qhov no yog qhov sib txawv tseem ceeb ntawm cov tseem ceeb thiab cov recessive alleles.
Hauv qab infogrphic qhia qhov sib txawv ntawm cov tseem ceeb thiab cov recessive alleles, piv.
Summary – Dominant vs Recessive Alleles
Txhua tus niam txiv pab ib qho allele rau txhua tus noob. Yog li ntawd, txhua tus noob feem ntau muaj ob lub alleles. Ntxiv mus, muaj ob hom alleles li dominant allele thiab recessive allele. Lub dominant allele yog cov muaj zog allele uas txiav txim siab phenotype. Nws tuaj yeem npog cov phenotype ntawm cov tsis muaj zog allele, uas yog cov allele recessive. Lub recessive allele tuaj yeem nthuav qhia nws cov phenotype tsuas yog thaum nws nyob hauv homozygous recessive xeev. Tab sis tseem ceeb allele tuaj yeem nthuav qhia nws cov phenotype hauv ob homozygous dominant thiab heterozygous xeev. Yog li, qhov no yog cov ntsiab lus ntawm qhov sib txawv ntawm qhov tseem ceeb thiab recessive alleles.
