Qhov sib txawv tseem ceeb ntawm qhov sib txawv ntawm qhov sib txawv thiab qhov sib txawv yog qhov sib txawv ntawm qhov sib txawv txiav txim siab zaus ntawm homozygous thiab heterozygous crossover uas tshwm sim thaum lub sij hawm meiosis. Meanwhile, recombination zaus yog qhov zaus uas crossover tshwm sim nyob rau hauv heterozygous noob.
Kev tshuaj ntsuam genetic crossover yog qhov xwm txheej tseem ceeb hauv kev muab kev hloov pauv caj ces rau cov xeeb ntxwv raws li meiosis. Yog li, kev sib txuas ntawm caj ces yog tshwm sim los ntawm kev sib txuas ntawm caj ces. Crossover yog homozygous lossis heterozygous hauv qhov xwm txheej. Thiab, qhov no yog lub tswv yim tseem ceeb hauv gene mapping.
Crossover zaus yog dab tsi?
Kev sib txuas ntawm caj ces tshwm sim thaum lub sijhawm meiosis. Qhov no ua rau muaj kev hloov pauv ntawm cov cim caj ces thaum tsim gamete. Yog li, nws ua rau kev hloov pauv caj ces ntawm cov kab mob. Lub crossover yuav siv qhov chaw nrog tsim ntawm ob-stranded so. Cov txheej txheem no yog kho los ntawm DNA topoisomerases. Kev tsim ntawm ob-stranded so ua rau crossover genetic khoom.
Daim duab 01: Crossover
Tus nqi uas qhov crossover tshwm sim yog qhov zaus ntawm crossover. Qhov kev ncua deb ntawm cov noob txiav txim qhov zaus ntawm crossover. Qhov zaus ntawm crossover txiav txim siab daim ntawv qhia caj ces ntawm ib qho gene. Crossover zaus tuaj yeem coj los ntawm homozygous crossover lossis heterozygous crossover.
Recombination zaus yog dab tsi?
Recombination yog qhov tshwm sim uas hla dhau los ntawm qhov sib txawv. Qhov zaus los yog tus nqi uas qhov recombination tshwm sim thaum lub sij hawm crossover yog qhov recombination zaus. Qhov nce ntawm recombination zaus qhia qhov txawv ntawm cov xeeb ntxwv. Qhov kev ncua deb ntawm cov noob txiav txim siab tus nqi uas recombination lossis heterozygous crossover tshwm sim. Yog li, thaum qhov kev ncua deb ntawm cov noob yog tsawg, qhov zaus ntawm recombination yog ntau dua. Qhov no ua rau muaj kev sib txuas ntawm caj ces ntau dua ntawm cov noob.
Dab tsi yog qhov zoo sib xws ntawm Crossover Frequency thiab Recombination zaus?
- Ob leeg tshwm sim thaum meiosis.
- Kev hla dhau yuav ua rau muaj qhov sib txawv ntawm qhov sib txawv thiab qhov sib xyaw ua ke.
- Qhov kev ncua deb ntawm ob lub noob txiav txim siab qhov zaus ntawm ob qho tib si crossover thiab recombination.
- Ob hom zaus yog siv los txiav txim qhov kev sib txuas ntawm caj ces thiab daim ntawv qhia gene.
Qhov txawv ntawm Crossover Frequency thiab Recombination zaus yog dab tsi?
Qhov sib txawv tseem ceeb ntawm qhov sib txawv ntawm qhov sib txawv thiab qhov sib txawv ntawm qhov sib txawv yog qhov uas crossover tshwm sim thaum meiosis. Crossover zaus yog hom zaus uas txiav txim siab tus nqi ntawm qhov crossover tshwm sim ntawm ob homozygous thiab heterozygous crossovers. Recombination zaus yog hom zaus uas txiav txim siab heterozygous recombination uas tshwm sim ntawm cov noob thaum lub sij hawm crossover. Tsis tas li ntawd, crossover zaus muaj qhov sib txawv tsawg, thaum qhov sib xyaw ua ke muaj qhov sib txawv siab.
Cov hauv qab no infographic qhia txog qhov sib txawv ntawm qhov sib txawv ntawm qhov sib txawv thiab qhov sib xyaw ua ke.
Summary – Crossover Frequency vs Recombination Frequency
Crossover zaus thiab recombination zaus qhia tus nqi ntawm qhov crossover tshwm sim hauv meiosis. Nyob rau hauv recombination zaus, lub crossover yog heterozygous nyob rau hauv cov xwm. Ob qho tib si crossover zaus thiab recombination zaus ua rau tus nqi ntawm qhov kev sib txuas ntawm caj ces tshwm sim. Yog li ntawd, ob qho tib si tseem ceeb hauv kev tsim daim ntawv qhia caj ces. Qhov kev ncua deb ntawm cov noob txiav txim siab crossover zaus thiab recombination zaus. Yog li, qhov no qhia txog qhov sib txawv ntawm qhov sib txawv ntawm qhov sib txawv thiab qhov sib xyaw ua ke.
