26 Apr '06 07:05>
Can somebody please help me here?
As I understand it, evolution is based on the following two principles:
1 During reproduction, small "copying errors" occur, call them mutations.
2 Natural selection then works on these copying errors, and beneficial ones are preferentially selected for continuation. The sum of many such beneficial mutations, over large amounts of time, effect the changes in the species and may form another specie.
If this is correct, then please explain the following to me. If this is NOT correct, then we don't have to go any further and please correct my mistake.
Assuming, however, that it is correct, then I have a real problem with the formation of some existing, internally consistent systems.
Take for example the simple system of chicken and egg.
If this evolved from something else, (whatever that may have been) can someone please explain to me how this system could have come about by small, incremental, beneficial mutations from any other system?
Can the intermediate stages, even over millions of years, be postulated from a non-egg laying reproductive system to an egg-laying reproductive system?
I read somewhere the reply given by Richard Dawkin to the chicken-and-egg question. His reply was that the chicken obviously came first, and there must have been a primordial chicken that lay the first egg. I assume that this was a tongue-in-cheek reply, since nobody could postulate that a non-egg laying animal could, in one generation, suddenly develop the complicated biological mechanisms to allow egg laying. But maybe he was serious, who knows? But I find this reply intensely dissatisfying.
This is an honest request. Can somebody please help me here?
In peace
Cal Just
As I understand it, evolution is based on the following two principles:
1 During reproduction, small "copying errors" occur, call them mutations.
2 Natural selection then works on these copying errors, and beneficial ones are preferentially selected for continuation. The sum of many such beneficial mutations, over large amounts of time, effect the changes in the species and may form another specie.
If this is correct, then please explain the following to me. If this is NOT correct, then we don't have to go any further and please correct my mistake.
Assuming, however, that it is correct, then I have a real problem with the formation of some existing, internally consistent systems.
Take for example the simple system of chicken and egg.
If this evolved from something else, (whatever that may have been) can someone please explain to me how this system could have come about by small, incremental, beneficial mutations from any other system?
Can the intermediate stages, even over millions of years, be postulated from a non-egg laying reproductive system to an egg-laying reproductive system?
I read somewhere the reply given by Richard Dawkin to the chicken-and-egg question. His reply was that the chicken obviously came first, and there must have been a primordial chicken that lay the first egg. I assume that this was a tongue-in-cheek reply, since nobody could postulate that a non-egg laying animal could, in one generation, suddenly develop the complicated biological mechanisms to allow egg laying. But maybe he was serious, who knows? But I find this reply intensely dissatisfying.
This is an honest request. Can somebody please help me here?
In peace
Cal Just