2011-03-28, 07:49
#13
[quote=LeHomme]Darwin uttalar sig inte alls om INDIVIDEN, däremot så "överlever" den GEN som ger maximerad reproduktion för värden (djuret eller människan)./QUOTE]Nu vill jag på inget sätt argumentera mot dig i sak eftersom det du skriver är helt korrekt. Men, det kan vara bra att poängtera att Darwin inte skrev om "gener" specifikt, då genetik inte var påkommet under den tiden. Vidare skrev Darwin ganska klart om "individer"... se citaten nedan.
"As many more individuals of each species are born than can possibly survive; and as, consequently, there is a frequently recurring struggle for existence, it follows that any being, if it vary however slightly in any manner profitable to itself, under the complex and sometimes varying conditions of life, will have a better chance of surviving, and thus be naturally selected. From the strong principle of inheritance, any selected variety will tend to propagate its new and modified form."
"Owing to this struggle for life, any variation, however slight and from whatever cause proceeding, if it be in any degree profitable to an individual of any species, in its infinitely complex relations to other organic beings and to external nature, will tend to the preservation of that individual, and will generally be inherited by its offspring ... I have called this principle, by which each slight variation, if useful, is preserved, by the term of Natural Selection, in order to mark its relation to man's power of selection."
Han skrev om individer i kontexten av en population och individens funktion som bärare och förmedlare av "ärvda egenskaper". Men hur dessa egenskaper förmedlades från föräldrar till barn var Darwin själv tydlig med att påpeka att han inte kände till speciellt väl...
"As many more individuals of each species are born than can possibly survive; and as, consequently, there is a frequently recurring struggle for existence, it follows that any being, if it vary however slightly in any manner profitable to itself, under the complex and sometimes varying conditions of life, will have a better chance of surviving, and thus be naturally selected. From the strong principle of inheritance, any selected variety will tend to propagate its new and modified form."
"Owing to this struggle for life, any variation, however slight and from whatever cause proceeding, if it be in any degree profitable to an individual of any species, in its infinitely complex relations to other organic beings and to external nature, will tend to the preservation of that individual, and will generally be inherited by its offspring ... I have called this principle, by which each slight variation, if useful, is preserved, by the term of Natural Selection, in order to mark its relation to man's power of selection."
Han skrev om individer i kontexten av en population och individens funktion som bärare och förmedlare av "ärvda egenskaper". Men hur dessa egenskaper förmedlades från föräldrar till barn var Darwin själv tydlig med att påpeka att han inte kände till speciellt väl...