Ukukhetha Natural: dimorphism ngokwesondo

dimorphism ngokwesini - ngumahluko ubume eziphilayo inkunzi nemazi zohlobo olufanayo. Yaziwa ngokubanzi isasazwe phakathi abameli zezilwanyana dioecious okanye izityalo, kwaye kubonakala iimpawu ezibonakalayo abantu abanjalo:

1. Ubukhulu. Iinkunzi ahluka iimazi bubungakanani, umzekelo, abameli emanzini, amabhinqa akamelwanga ezinkulu.
2. Entlonzeni. Ngokomzekelo, xa abantu kunokuba ukuba iindevu amadoda.
3. Umbala. Ngokomzekelo, xa iintaka - iintsiba umbala.
4. Skin. Ochazwa kwimfundo ezongezelelweyo kunye neempawu zesini eziziisekondari. Umzekelo, iimpondo nezamaxhamakazi okanye ngepaint ikama.
5. Amazinyo. Xa izilwanyana eyindoda, ezifana isilo solwandle esinamabamba amade kunye endlovu makhulu kancinane nabasetyhini.

Ngenxa yoko, dimorphism kwezesondo inokuthi ngokuba umlinganiselo isithembu (inqanaba wayo), kwaye licace lubonakaliswa, mkhulu umahluko kwi igalelo inkunzi nemazi ekunyamekeleni abantwana babo. Ngamanye amaxesha PD okunokubonakaliswa iimpawu ezinjalo, leyo ukunciphisa ukusebenza abanini bazo. Ngoko ke, usiba eqaqambileyo, ukucula ivumba elikhulu okanye kabukhali ezinye iintaka badla ukutsala ingqalelo ezidla, nto leyo yingozi ubomi babo. Oku kubangelwa, mhlawumbi, kungekhona kwemvelo kanye nokukhetha ngokwesondo.

dimorphism Sexual ngeendlela ezininzi:

1. PD Reproductive - yinto rhoqo nge sex, kokubini ezaseprayimari nezasesekondari, ezahlukileyo kuzo zombini nabafazi yaye zinxulumene inkqubo yokuzala. Olu hlobo hormone of dimorphism ngokwesondo, apho umsebenzi - ukwenza udweliso lwenkqubo nobudala.
2. Ukuguqulwa dimorphism ngokwesondo - okwethutyana kwaye kuvela kuba utshintsho ngesondo nemazi ngenxa yokhetho. Kulo mzekelo, kukho izakhi ezintsha aye kuvavanywa DNA eyindoda.

PD ithathwa njengokuba ukuzalana ababhinqileyo kunye neempawu into eyindoda, ijolise zokubumba ukuthambekela enye kwenye, nto leyo idala imfuneko ukuzalana kwabantu emzimbeni nasengqondweni. Ngenxa yoko, lujolise zizalana kulo kwisizukulwana, nayo kwizinga yemfuza, kukho indalo kunye nophuhliso lolawulo eziphilayo lweempawu esihle ngamnye.

Kufuneka ke ukuba dimorphism ngokwesondo lubonakaliswa inani elikhulu yomahluko komzimba, ngokwasemzimbeni kunye indlela yokuziphatha phakathi kwabantu besini esahlukileyo. Ngoko ke, ngokusebenzisa elibambeleyo ababhinqileyo ukhetho gulwa, isini oyindoda ithe yadala ithuba lula ukumisela yendaleko. inzululwazi Modern sinika ingcaciso ecace gca kubukho umahluko ngokwesini kuwo onke amazinga yophuhliso eziphilayo.

Kwezilwanyana, PD luphawulwa umahluko kubume amalungu copulatory okanye iimpawu sex eziziisekondari. Apha anesiko ukwahlula dimorphism ngokwesondo ngamaxesha kunye esisigxina. Apho lokuqala akuxhomekekanga namaxesha onyaka.

dimorphism ngokwesondo womntu zibalulwe kuphuhliso eyomeleleyo asemzimbeni kunye nemisipha, kwakunye iinwele kumadoda. Emabeleni kwezoqoqosho ngakumbi ababhinqileyo, iinyonga ububanzi kunye nangaphezulu.

Xa PD izityalo ezibonakaliswe umahluko phakathi isakhiwo kunye nobungakanani neziqu, namahlamvu ukuxinana, ubume iintyatyambo kunye ezahlukeneyo ngeendlela ezininzi.

Ngenxa yoko, ukuvela kunye nophuhliso dimorphism ngokwesini kuzo zonke izinto kubangwa kwimpembelelo kwemvelo kanye ngokwesini. Kulo mzekelo, ibhayoloji mihla unemisebenzi iingxoxo wakhetha ukuba PDP ichazwa nje kuphela isakhiwo nokusebenza esini, lifaka lesibini, emfundo ephakamileyo, kwaye ukude iimpawu umsebenzi ngokwesondo, nto leyo zithetha iinkqubo ngokwasemzimbeni kunye nemisebenzi yabo nayo. Sinokuthi zonke ezi mpawu zinxulumene onke amanqanaba yentlangano komba, ukusuka kwinqanaba ezinto eziphilayo nesiphelo kunye organismic.