Puas yog xim tawv nqaij ua piv txwv ntawm kev ua tsis tiav?
Puas yog xim tawv nqaij ua piv txwv ntawm kev ua tsis tiav?

Video: Puas yog xim tawv nqaij ua piv txwv ntawm kev ua tsis tiav?

Video: Puas yog xim tawv nqaij ua piv txwv ntawm kev ua tsis tiav?
Video: Yuav tawm ntawm txoj kev txom nyem tau li cas? 2024, Kaum ib hlis
Anonim

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.

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