Combinative masiyanidwe ndi tanthauzo lake zamoyo zinachita

Combinative masiyanidwe ndi chochititsa chachikulu cha intraspecific zosiyanasiyana zamoyo zonse. Koma mtundu wa kusinthidwa chibadwa kumabweretsa mapangidwe ma latsopano la makhalidwe kale. Ndipo konse combinative masiyanidwe ndi asilikali ake si chifukwa maonekedwe a ma kuti ayambe mbewu. Zikamera wa katundu watsopano kwathunthu chifukwa yofanana osiyana jini, zotheka pa nkhani ya kusintha intraspecific mutational.

Combinative masiyanidwe anatsimikiza ndi chikhalidwe cha ndondomeko ya ubereki. Mtundu wa kusinthidwa chibadwa khalidwe maonekedwe a genotypes latsopano pamaziko a ma utangoyamba mbewu. Combinative masiyanidwe kumaonekera kale mu gawo la mapangidwe gametes (nyongolosi maselo). Komanso, mukachipinda amenewa ukufanizidwa ndi chimodzi chokha magazi khromozomu kwa gulu lirilonse. Yodziwika ndi chakuti DNA kugwera nyongolosi selo mosintha, umene gametes mu chimodzi chamoyo zingasiyane kwambiri okwanira pa akonzedwa mbewu. Sikuti kukhala kusintha kulikonse mu chikhalidwe mankhwala chonyamulira mwachindunji mauthenga cholowa.

Choncho, combinative masiyanidwe chifukwa zosiyanasiyana recombination imene imachititsa ali kale mu akonzedwa kuti asakhale ndi vutoli. Mtundu wa kusinthidwa chibadwa amadziwikanso osati conjugate ndi kusintha khromozomu ndi jini nyumba. Magwero combinative masiyanidwe kokha njira zimene zimachitika pa kuchepetsa magawano selo (meiosis) ndi umuna.

Pulayimale (zing'onozing'ono) wagawo recombinations osiyana cholowa zinthu, kuchititsa mapangidwe ma jini latsopano, wotchedwa RECON. Aliyense recon limafanana nucleotides awiri (ndi zomangila asidi wa mkati) mu awiri Shackleton mamolekyulu DNA ndi nyukiliotayidi umodzi, pamene izo zifika pa Kapangidwe ka mavairasi osakwatiwa-Shackleton asidi mkati. Recon si divisible pamene kudutsa (kuwombola ndondomeko pakati pa wophatikizidwa DNA magazi pa conjugation) ndipo nthawi zonse pogonana yonse.

Combinative masiyanidwe mu maselo eukaryotic m'njira zitatu:

1. Majini recombination m'kati kuwoloka-pa, umene DNA anapanga ndi ma watsopano alleles.
2. Independent mwachisawawa kupezeka DNA pa anaphase wa woyamba meiotic magawano sitepe, limene onse gamete kupeza zinthu zawo chibadwa.
3. Wamba maselo TINKAKUMANA nyongolosi pa umuna.

Choncho kudzera mwa njira zitatu izi combinative masiyanidwe lililonse zygote selo anapanga ndi maphatikizidwe wa gametes, amapeza akonzedwa wapadera kwambiri ndi mfundo chibadwa. Kuti zosintha ngati cholowa anafotokoza zosiyanasiyana yaikulu mwa mitundu. Majini recombination n'chofunika kwambiri kuti zamoyo za mtundu uliwonse, monga zinalengedwa mwa osawerengeka zosiyanasiyana genotypes. Ichi chimapereka heterogeneity uliwonse wa anthu. Maonekedwe a zamoyo, okutidwa ndi makhalidwe yake payekha, ndiyo Mwachangu mkulu wa kusankha zamoyo, kumupatsa mpata kuti ndichoka kuphatikiza bwino kwambiri makhalidwe cholowa. Chifukwa cha kukhazikitsidwa kwa zinthu zatsopano ndondomeko ya ubereki, zikuchokera majini ndi mosalekeza bwino.