Video: Puas yog xim tawv nqaij ua piv txwv ntawm kev ua tsis tiav?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Tsis tiav dominance tshwm sim nyob rau hauv lub polygenic qub txeeg qub teg ntawm qhov zoo xws li qhov muag xim thiab tawv nqaij xim . Tsis tiav dominance yog ib daim ntawv ntawm cov qub txeeg qub teg nyob rau hauv uas ib tug allele rau ib tug tshwj xeeb zoo yog tsis kiag li qhia tag nrho nws cov khub allele.
Khaws qhov no hauv kev xav, uas yog ib qho piv txwv ntawm kev ua tsis tiav?
Thaum ib tug niam txiv nrog cov plaub hau ncaj thiab ib tug nrog cov plaub hau curly muaj ib tug me nyuam nrog wavy plaub hau, uas yog ib tug piv txwv ntawm tsis tiav dominance . Qhov muag xim feem ntau raug suav hais tias yog ib qho piv txwv ntawm tsis tiav dominance.
Ib yam li ntawd, puas yog hom ntshav AB ua tsis tiav? Kev sib xyaw ntawm alleles zoo, txawm li cas los xij, alleles yuav yog codominant-i.e., tsis ua raws li tseem ceeb los yog recessive. Ib qho piv txwv yog tib neeg ABO ntshav qhov system; cov neeg nrog type AB muaj ib qho allele rau A thiab ib qho rau B. (Cov neeg uas tsis yog hom O.) Saib thiab kev tswj hwm ; kev tsis txaus ntseeg.
Hais txog qhov no, koj ua li cas qhia tsis tiav dominance?
Yog tias phenotype yog "liab" ces r allele yog tseem ceeb rau b. Yog tias phenotype yog "xiav" ces b allele yog tseem ceeb rau r. Yog hais tias phenotype yog "liab" ces cov alleles qhia tsis tiav dominance . Yog tias phenotype muaj qee hom hlwb "liab" thiab lwm tus "xiav" ces cov alleles no ua yeeb yam codominance.
Yog vim li cas tsis tiav dominance tsis sib tov?
Ib tug cwj pwm tau txais los ntawm tsis tiav dominance yog tsis yog ib sib tov ntawm ob alleles vim hais tias ob qho tib si aer sib npaug thiab tshwm sim ntawm phenotype. Cystic fibrosis, uas ua rau muaj teeb meem ua pa thiab tuag, yog tshwm sim los ntawm cov noob caj noob ces.
Pom zoo:
Kev tswj tsis tiav txhais tau li cas muab piv txwv?
Incomplete dominance txhais tau hais tias ib qho allele tsis yog qhov tseem ceeb lossis tsis muaj zog. Ib qho piv txwv yuav yog cov alleles rau cov noob uas txiav txim siab xim zoo nkauj ntawm tsob ntoo Mirabilis. Tom qab cov me nyuam loj hlob tuaj, peb yuav tsum xyuas cov txiaj ntsig thiab yog tias qee qhov liab qab, ces cov xim alleles tsis ua tiav
Dab tsi yog qhov txawv ntawm qhov kev txwv tsis kawg thiab kev txwv ntawm infinity?
Daim ntawv ceeb toom yuav ua li cas thaum peb tab tom cuam tshuam nrog qhov kev txwv tsis kawg, nws yog qhov ntsug asymptote. Kev txwv ntawm infinity yog asymptotes ib yam nkaus, txawm li cas los xij, cov no yog kab rov tav asymptotes peb tab tom cuam tshuam nrog lub sijhawm no. Cov kev txwv ntawm infinity muaj teeb meem qhov twg "txwv li x mus txog infinity lossis tsis zoo infinity" yog nyob rau hauv cov cim
Qhov twg yog ib qho piv txwv ntawm cov lus teb tsis tiav com?
Ib qho zoo uas qhia txog kev ua tsis tiav yog ib qho uas cov xeeb ntxwv heterozygous yuav muaj ib qho phenotype uas yog kev sib xyaw ntawm ob niam txiv kab mob. Nov yog qee qhov piv txwv: Ib lub paj liab thiab daj paj mating los ua paj txiv kab ntxwv. Ib tug miv dawb thiab dub miv muaj grey kittens
Yuav ua li cas yog ib tug snapdragon piv txwv ntawm tsis tiav dominance?
Cov paj liab no yog qhov tshwm sim ntawm kev ua tsis tiav. Txawm li cas los xij, kev sib xyaw cov paj liab ua rau ¼ liab, ¼ dawb thiab frac12; liab. Pink snapdragons yog qhov tshwm sim ntawm kev ua tsis tiav. Hla-pollination ntawm liab snapdragons thiab dawb snapdragons ua rau liab dawb thaum tsis yog dawb los yog liab alleles yog dominant
Dab tsi yog qee qhov piv txwv ntawm kev cuam tshuam tsis zoo ntawm tib neeg ib puag ncig kev cuam tshuam?
Kev ua liaj ua teb tuaj yeem cuam tshuam tsis zoo rau peb ib puag ncig, suav nrog kev poob ntawm biodiversity, dej paug, kev hloov pauv huab cua, av yaig thiab muaj kuab paug