Nyob rau hauv tus ntoo khaub lig ntawm paj yeeb paj heterozygous nroj tsuag (Pp), lub tsab ntawv P sawv cev rau allele rau cov paj ntshavthiab tsab ntawv p sawv cev rau cov paj dawb.
Yuav ua li cas yog tus ntoo khaub lig ntawm cov nroj tsuag uas heterozygous rau paj liab PP nrog lub paj uas yog homozygous recessive rau paj dawb PP yuav tsim ib tsob nroj nrog paj dawb?
Tshawb xyuas qhov tshwm sim ntawm kev sib xyaw ntawm gametes tsim los ntawm ob tsob ntoo hla siv Punnet Square txoj kev, nws pom tias 75% cov nroj tsuag yuav muaj tsawg kawg yog ib qho tseem ceeb allele (P) thiab yog li yuav dais paj paj. Tsuas yog 25% cov nroj tsuag yuav muaj cov allele recessive hauv homozygous xeev (pp).
Puas yog paj liab doog heterozygous?
Ib tsob ntoo nrog ob qho sib txawv alleles yog heterozygous. Tus yam ntxwv uas peb pom nrog peb lub qhov muag yog phenotype. Rau Pp, phenotype yog paj liab.
Thaum hla 2 heterozygous ntshav paj paj ntoo qhov genotypic piv yog?
Ob tug taum cog, ob qho tib si heterozygous rau paj xim, hla. Cov xeeb leej xeeb ntxwv yuav pom cov xim liab dominant nyob rau hauv ib tug3: 1 piv. Los yog, kwv yees li 75% ntawm cov xeeb ntxwv yuav ntshav.
Qhov tshwm sim yog dab tsi uas cov xeeb ntxwv ntawm tus ntoo khaub lig qhia cov nroj tsuag nrog cov paj liab phenotypes?
Ib tug ntoo khaub lig ntawm ob heterozygous nroj tsuag (Pp) yuav tsim tau plaub tug xeeb leej xeeb ntxwv nrog genotypes PP, Ppthiab pp hauv qhov sib piv 1: 2: 1. PP thiab Pp genotypes yog ntshav paj thaum lub pp yog paj dawb. Yog li ntawd, qhov tshwm sim ntawm cov paj liab paj los ntawm tus ntoo khaub lig no yog 3 tawm ntawm 4 i.e. 3/4.
