Wadatacce
Tsarin zabin yanayi yana nufin ɗaya daga cikin hanyoyin juyin halittar nau'in rayayyun halittu, wanda Charles Darwin da Alfred Russel Wallace suka gabatar, daga inda suka yi bayanin ƙirar halitta.
Zaɓin yanayi yana faruwa godiya ci gaba da karbuwa ga jinsuna zuwa muhallin su. Lokacin da mutanen da ke da wasu halaye suna da ƙimar rayuwa mafi girma fiye da sauran membobi na jama'a, suna ba da waɗannan sifofin gado na gado ga zuriyarsu.
Duba kuma: Daidaitawa a Abubuwan Rayuwa
Juyin Halitta
Zaɓin yanayi shine tushen tushen duk canjin juyin halitta, kasancewar kuma shine hanyar da mafi kyawun ƙwayoyin da ke daidaita su ke kawar da waɗanda ba su dace da su ta hanyar jinkirin tattarawar halittu ba. canjin kwayoyin halitta.
Gudummuwar da mutum ya bayar ga tsara ta gaba ana gane shi azaman ingancin ilmin halitta, kuma ɗabi'a ce mai ƙima wacce ta ƙunshi wasu da yawa, da ke da alaƙa da rayuwar mafi ƙanƙanta da kuma rarrabuwar rarrabuwar halittu daban -daban.
Tushen asali na zaɓin yanayi shine halaye na gado ne, amma duk da haka akwai canjin yanayi a tsakanin samfura daban -daban. Ta wannan hanyar, akwai daidaita yanayin halittu ga muhalli, kuma wasu halaye ne kawai na sabon bayyanuwa ake miƙawa ga dukkan alumma.
Tsararraki suna cikin juyin halitta na dindindin, kuma daidai ne saitin bambancin wanda ake samarwa cikin tsararraki abin da ya ƙunshi Juyin halitta.
Yana iya ba ku: Menene zabin wucin gadi?
Misalan zabin yanayi
- Juyin halittar magani ya dogara ne akan gaskiyar cewa daga amfani da maganin rigakafi ga ƙwayoyin cuta ko ƙwayoyin cuta yana yiwuwa a kashe wasu daga cikinsu, amma waɗanda suka tsira sun zama masu juriya.
- Farin fur ɗin dabbobin arctic, wanda ke basu damar ɓoyewa cikin dusar ƙanƙara.
- Rufewar da aka yi, wanda ke sa su zama kamar ganye.
- Motsi na gannet mai kafa mai launin shuɗi, don jawo hankalin abokin aurensa.
- Raƙuman rakumi, waɗanda mafi tsawo a cikinsu suka tsira.
- Canjin launi na hawainiya lokacin da yake da ganima, ko don kare kanta.
- Tsarin cloning, koyaushe yana ƙarƙashin ci gaba amma an riga an tabbatar da shi a zahiri, na iya yuwuwar tsoma baki tare da zaɓin yanayi.
- Ƙwayoyin Brown suna da mafi kyawun damar rayuwa, kuma suna da ƙarin zuriya, yawan jama'a yana yawaita.
- Lamarin duk nau'in da ya ɓace, kuma har yanzu yana ci gaba da yin hakan.
- Damisa, wanda mafi sauri ya tsira daga cikinsu.
- Juyin halittar ɗan adam a cikin nau'ikan daban -daban, wanda ake kira hominids.
- Lalacewar kuncin maciji don hadiye abin da ya fi girma.
- Canjin launi na wasu asu, wanda juyin juya halin masana'antu a Ingila ya motsa. (Anan canjin yanayi ya samo asali daga mutum)
- Rawar rawa na ƙudan zuma.
- Tsayayya da magungunan kwari na wasu kwari, wanda ke nuna alamar tambaya a matsayin tushen rayuwa.
- Siffar guntun finches ɗin ta canza lokaci bayan lokaci, saboda bayan fari sai suka taurare, ta basu damar cin tsaba masu ƙarfi.
- Ikon ɗan adam ya koyi yin magana.
- Orchids waɗanda ke iya yaudarar wasps zuwa 'mating' tare da su.
- Macizai masu ba da guba, waɗanda ke haɗe da macizan murjani masu guba.
- Ayyukan farilla na tsuntsaye.
Tsarin layi da ci gaba?
Tambayar juyin halitta tana nufin ƙarin la'akari, domin idan halaye sun wuce ta hanyar juyin halitta kamar yadda aka bayyana, a jeri na layikan jinsuna, samun haɗa kowane ɗayan bambance -bambancen ƙwayoyin halittar da ke bayyana.
A karkashin wannan jigo ne aka aiwatar da sarkar juyin halitta wanda a ƙarƙashinsa ra'ayin a hanyar haɗi, bambancin da ya ɓace don cikakken bayyana juyin halitta. Koyaya, wannan ba abin da ke faruwa: juyin halitta yana da ginshiƙai, tare da gauraya tsakanin jinsuna da gyare -gyare gwargwadon daidaitawa daban -daban ga muhalli, wanda ya zama gyara wanda ya bar wannan ra'ayin na haɗin haɗin da ya ɓace.
Gabatarwar Darwiniyanci
An sake yin tambayar zaɓin yanayi ta hanyar kwatankwacin sauran yankuna, kuma ta hanyar fadada ra'ayin darwiniyanci Ya yi bayanin daidai waɗannan wuraren, inda mafi ƙarfi da ƙarfi shine wanda ke tsira yayin da waɗanda ba su dace da haka ba. Lokacin da yazo hanyoyin zamantakewaA bayyane yake cewa Darwiniyanci mummunan hali ne da tashin hankali.
Don aiwatar da zaɓin yanayi don faruwa, ya zama dole cewa akwai ingantaccen tasirin ilimin halittu, cewa nau'in phenotypic yana da canji, kuma wannan bambancin yana faruwa ta hanyar gado.
Karin bayani?
- Misalan Zaɓin Artificial
- Misalan Daidaitawa (na abubuwa masu rai)
- Misalan Bambancin Halittu
