But this (a listing of illustrations of how the genome can change other than by mutations) doesn't constitute a crisis-it's a very interesting finding that shows that variation in a genome can arise by processes other than mutation of an organism's own DNA. The disposition of that variation still must occur via either natural selection (it can be good or bad) or genetic drift (no effect on fitness). This hasn't really changed the theory of evolution one iota, though it's changed our view of where organisms can acquire new genes.
Jerry CoyneRelated topics
bad change evolution fitness good iota listing mutation natural selection variation view genomeRelated quotes
We can teach no virtues we do not practice," occurred to me this afternoon; for without learning by experience how a virtue is acquired, how can we teach any one to acquire it? I thought of this in connection with the experience of undutiful children. By the working of this natural cause, they will not make their own children dutiful. Read in Luke of the angel which appeared to Christ in Gethsemane, strengthening Him. We all see this angel when we say truly, "Thy will, not mine, be done.
Julia Ward Howe
Nature is just a dictionary, you hunt in it for words.. ..you find in it the elements which make a phrase or a story; but nobody would regard a dictionary as a composition in the poetic sense of the term. Besides, nature is far from being always interesting from the point of view of the effect of the whole.. .If each detail is perfect in some way, the union of these details seldom gives an effect equivalent to that which arises, in the work of a great artist, from the total composition.
Eugène Delacroix
A complete theory of evolution must acknowledge a balance between "external” forces of environment imposing selection for local adaptation and "internal” forces representing constraints of inheritance and development. Vavilov placed too much emphasis on internal constraints and downgraded the power of selection. But Western Darwinians have erred equally in practically ignoring (while acknowledging in theory) the limits placed on selection by structure and development-what Vavilov and the older biologists would have called "laws of form.”.
Stephen Jay Gould
Well, I think the way you feel as a teenager stays with you, forever. I really believe that. And we try to change and we hope that we change, but we don't really in big ways, in serious ways. I think the personality is formed at that time, for the good and for the bad. ... We all want to grow up and move on and appear to be different to people. And we want people to see us in a different way. But, I don't know, I think the personality is very, very strongly cemented, and we just bear whatever shortcomings we have and learn to live with it.
Morrissey
Nothing can better express the feelings of the scientist towards the great unity of the laws of nature than in Immanuel Kant's words: "Two things fill the mind with ever new and increasing awe: the stars above me and the moral law within me."... Would he, who did not yet know of the evolution of the world of organisms, be shocked that we consider the moral law within us not as something given, a priori, but as something which has arisen by natural evolution, just like the laws of the heavens?
Konrad Lorenz