Ukukhetha Natural sisoloko nto iphambili inguqu eziphilayo. Yena izenzo yi indlela efanayo - kusinda nokulondoloza nenzala elinamandla, ie, ixoxo nexoxo liyazigxumela. Nangona kunjalo, ngokuxhomekeke impumelelo yayo, ulwalathiso, ingakumbi iimeko zempilo eziphilayo - indlela yokukhetha zendalo inokuba nomahluko. Ngaloo ndlela, enye iifom zawo ukhetho olutshintshayo (zemiyalelo), nto leyo impendulo utshintsho kwimeko bume yendawo kwaye unegalelo ukutshintsha lo msebenzi kakubi okanye impahla. Kuba iimpawu ubuninzi ixabiso umlinganiselo ixabiso yokalo emileyo kuthetha, umzekelo --avareji yenani sazala. A incazelo kwiipropati qualitative wagqiba frequency (ipesenti) leesampulu kunye inkalo kuyimfuneko, umzekelo - ziyanda neenkomo hornless nombala.
Uhlalutyo kwezi Propati ibonisa utshintsho ziye zavela labemi ngenxa kukhubazeko neemeko zokusingqongileyo ukutshintsha. Kulo Ukukhetha enezinto nga igalelo kuzo zombini ukomeleza buthathaka iimpawu eziguqukayo zeli eziphilayo. Umzekelo inzuzo Uphawu isenokuba melanism ekuthiwa-mveliso. View butterfly moth yayifafazeke kwiindawo ezingezo-mveliso kuye ukukhanya elinombala isikali eziquka umzimba kunye amaphiko, nakwiindawo kunye nenani elikhulu mveliso imibala yabo omnyama. Ukuvela kungonakalisi nundu engaqhelekanga ukuba imibala ngenxa yokuba ukuba ukukhutshwa mveliso eziyingozi ziye zakhokelela ekubeni ukufa ulele ukuba waphila amaxolo zemithi amabhabhathane bakhonza njengendawo yokuhlala (kombala olukhuselayo). Umbala isikali Ukutshintsha kuphucula amathuba okuphila zala mabhabhathane. Kulo mzekelo, oko kwadala yokukhetha ebizwa njalo-- ukulondolozwa kunye nokukhuthazwa kunokuvela uhlobo olutsha amabhabhathane ukuba yokutshintsha kweemeko bayakwazi ukuqhubeka gqatso, oko kukuthi, azale.
Umzekelo Uphawu eziphango na ilahleko okanye ukuncitshiswa umzimba kunye namalungu ayo Ngenxa yokuba ke akathanga kuthwala umthwalo esebenza - amaphiko njengenciniba (hayi eziphaphazelayo), ukungabikho kwamalungu e iinyoka.
Ukukhetha Dynamic kusekelwe ngumntu. Ngoko ke umntu ekukhetheni abantu njengoko abathile iparameters (phenotype), kwandisa rhoqo kule propati. Empirically kuye kwabonisa ukuba le sikhetha imbonakalo yazo ikhokelela utshintsho kweejini, kwaye mhlawumbi ilahleko kwezinye alleles. Kukho ezinye iintlobo ze ukhetho ngumntu - zingqondweni kunye lwemethodoloji. Xa usebenzisa kukhethwe umntu zingqondweni, njengoko ungaziva ikhetha lo engcono. Kwesiphumo kwesampuli enjalo xa kukuvela iintlobo ezintsha emaXhoseni uphawu ngenxa bendawo ethile. Umgaqo Methodological ezisetyenziswa ekukhetheni ukuvelisa iintlobo ezintsha izityalo kunye nezilwanyana eziqhelene neemeko ezikhulayo ethile yokuhlala (ratseny iintlobo ebandayo-resistant).
Ngenxa yoko, ukukhethwa olutshintshatshintshayo - yindlela yokhetho zendalo, isiphumo yayo imbonakalo uhlobo olutsha yokuviwa eziphilayo leyo kusinda baze baqhubeke intsapho yabo kukutshintsha bume.