Where natural selection slackens, new forms may arise which would not survive under more rigid competition, and many ultimately hardy combinations wi… - J.B.S. Haldane

" "

Where natural selection slackens, new forms may arise which would not survive under more rigid competition, and many ultimately hardy combinations will thus have a chance of arising. ...Thus the distinction between the principal mammalian orders seems to have arisen during an orgy of variation in the early Eocene which followed the doom of the great reptiles... Since that date mammalian evolution has been a slower affair, largely a progressive improvement of the types originally laid down in the Eocene.
Another possible mode of making rapid evolutionary jumps is by hybridisation. ...hybridisation (where the hybrids are fertile) usually causes an epidemic of variation in the second generation which may include new and valuable types which could not have arisen within a species by slower evolution.

English
Collect this quote

About J.B.S. Haldane

John Burdon Sanderson Haldane (5 November 1892 – 1 December 1964) was a British geneticist and evolutionary biologist.

Biography information from Wikiquote

Also Known As

Native Name: John Burdon Sanderson Haldane
Alternative Names: J. B. S. Haldane
Try QuoteGPT

Chat naturally about what you need. Each answer links back to real quotes with citations.

Related quotes. More quotes will automatically load as you scroll down, or you can use the load more buttons.

Additional quotes by J.B.S. Haldane

To the biologist the problem of socialism appears largely as a problem of size. The extreme socialists desire to run every nation as a single business concern. I do not suppose that Henry Ford would find much difficulty in running Andorra or Luxembourg on a socialistic basis. He has already more men on his pay-roll than their population. It is conceivable that a syndicate of Fords, if we could find them, would make Belgium Ltd. or Denmark Inc. pay their way. But while nationalization of certain industries is an obvious possibility in the largest of states, I find it no easier to picture a completely socialized British Empire or United States than an elephant turning somersaults or a hippopotamus jumping a hedge.

You can drop a mouse down a thousand-yard mine shaft; and, on arriving at the bottom, it gets a slight shock and walks away. A rat would probably be killed, though it can fall safely from the eleventh story of a building; a man is killed, a horse splashes.

Unlimited Quote Collections

Organize your favorite quotes without limits. Create themed collections for every occasion with Premium.

Loading...