Combinative a iponahatsa le se boleloang lona ho iphetola ha lintho

Combinative a iponahatsa e le sesosa ka sehloohong ea intraspecific tšoane ha lintho tse phelang tsohle tse phelang. Empa mofuta ona oa phetolo liphatsa tsa lefutso e isa feela hore ho thehoe tlhakantsuke e ntjha ya mekhoa ntse ba le teng. Me le ka mohla combinative a iponahatsa le mekgwa lona u se ke a etsa hore ponahalo ea tlhakantsuke ya ho feletseng fapaneng phatsa ea lefutso. Ho hlaha ha thepa e ncha ka ho feletseng ka lebaka la mekete e fapaneng fapaneng phatsa ea lefutso, khoneha feela tabeng ea liphetoho intraspecific mutational.

Combinative a iponahatsa e behilweng ke mofuta wa tshebetso hlahisa bana. Bakeng sa mofuta ona wa phetolo liphatsa tsa lefutso bath ponahalo ea genotypes e ncha ka lebaka la tlhakantsuke e sa tsoa thehoa phatsa ea lefutso. Combinative a iponahatsa bontša ka boeona e se a ntse a kgato ya sebopeho sa diretswe go dira gametes (kokoana-hloko le ka liseleng tsa). Ho feta moo, e mong le e seleng e joalo e emeloang ke le 'ngoe feela homologous chromosome ho tloha mong le e para. Tšoauoa ka 'nete ea hore chromosomes oela kokoana-hloko seleng e ka lootho, oo ka oona diretswe go dira gametes e nngwe phelang' na tsa fapana ka matla ka ho lekaneng ho sete phatsa ea lefutso. Ha ho hlaha ho ba le liphetoho leha e le efe mofuta tsa lik'hemik'hale tsa microcyteme e tobileng ea lesedi lefa.

Kahoo, combinative a iponahatsa ka lebaka la mefuta e fapaneng ya recombination tsa liphatsa tsa lefutso li se le teng ka sete ya chromosome. mofuta ona wa phetolo liphatsa tsa lefutso e le tsona ha conjugate le liphetoho tse ka chromosome le phatsa ea lefutso dibopeho. Mehloli combinative a iponahatsa ka 'na ba feela le thulaganyo hore etsahala nakong ea fokotsa karohano seleng ea (meiosis) le peō.

Mathomo (nyenyane ka ho fetisisa) unit trust recombinations fapaneng lefa lintho tse bonahalang, a etsa hore sebopeho sa tlhakantsuke phatsa ea lefutso e ncha, e bitswang RECON. E mong le e recon tšoana le nucleotides tse peli (mohaho oa lintho tse bonahalang tse acid e ea nucleic) ka habeli-tsielehile limolek'hule DNA le nucleotide se nang balekane, ha ho tluoa tabeng ea sebopeho sa likokoana-hloko tse se nang balekane-tsielehile acid e nucleic. Recon hase aroloe ha tšelela (phapanyetsano thulaganyou e pakeng tsa di behuwe ka bobedi chromosomes homologous nakong conjugation) le ka maemong 'ohle a tšoaetsanoang ka ka ho feletseng.

Combinative a iponahatsa ka lisele tse eukaryotic ka litsela tse tharo:

1. Liphatseng tsa lefutso recombination ka tshebetso ya ho tšela-fetang, oo ka oona ho chromosomes ba bōpeha le tlhakantsuke e ntjha ya alleles.
2. Ikemetseng tšohanyetso hasana ha chromosomes nakong anaphase tsa pele meiotic karohano mohato, oo ka oona kaofela gamete fumana makgetheng bona liphatsa tsa lefutso.
3. Ho itlosa bolutu ka lisele tse kopana kokoana-hloko nakong eo peō.

Kahoo, ka tsela ya mekgwa tsena tse tharo combinative a iponahatsa e mong le e zygote seleng ea thehoa ke logan ea diretswe go dira gametes, fumanang sete buka e ikhethang ka ho feletseng ba fumana boitsebiso bo liphatseng tsa lefutso. Hore diphetolo joalo lefa hlalosa mefuta-futa e e khōlō ka hare ho mefuta e. Liphatseng tsa lefutso recombination ntho ea bohlokoa haholo bakeng sa ho iphetola ha lintho tsa mefuta leha e le efe, ha e ntse e e bōpileng ka se nang palo tse sa tšoaneng genotypes. Sena se etsa hore heterogeneity efe kapa efe ea baahi. Ponahalo ea lintho tse phelang, re filoe litšobotsi tse ba lona motho, ea etsang qeto ea bokgoni phahameng ya kgetho tsa tlhaho, ho mo fa monyetla oa ho tsamaea feela ha e kopana le atlehileng ka ho fetisisa ea litšobotsi lefa. Thanks ho akaretseng tsa lintho tse phelang le lecha ho tshebetso ho ikatisa, ea ho hlophisoa liphatsa tsa lefutso e sa khaotse a ntlafala.