So, in response to my inviting mijo to give an example of a comaparable analogy that essentially, in his opinion, sucks, you provide a widely-accepted analogy that continues to be used in the classroom. What do you seek to prove by this? The only thing it seems to show is that, in your opinion, the OP analogy is sound.
No, saying that there are analogies that have some utility does not mean that the OP is one of them.
A general point: models are only useful if the limitations are clearly stated, i.e. if it is understood where the analogy breaks down.
How about:
"Biological evolution is a bit like that subset of technical development that utilises evolutionary approaches, if you ignore the fact that in engineering, these approaches direct the development to meeting intelligently assigned requirements.
If you ignore the need for an intelligent agency, you can thus show that you don't need an intelligent agency"
I agree with the first paragraph, but it is trivial, the second paragraph is wrong.
Until this thread, I thought it was obvious that self-replication is needed for natural-selection. Now I realise that it isn't so obvious, but the requirement is still there:
In Darwinian evolution, the direction of evolution is determined by the selection pressures. A self-replicating system wll thus be selected for reproductive success, i.e. the with self-replicating systems there is selection for self-replication; this selection is inherent in a self-replicating system. This inherent selection
is natural selection.
If a system does not self replicat, but is developing with an evolutionary approach, then something else has to perform the copying, and you need a selective pressure. This means that the copier has to copy only that which is selected. Without self-replication there has to be external selection, and this will be as the result of an intelligent agency.
Maybe you decide variants which survive for a certain length of time are selected, then you are selecting for variants that survive for this length of time. Maybe you decide on variants that survive until they acquire a certain amount of resources, then you are half-way to self-replication.
I really don't see the point in showing other poor analogies, which would only show that there are other analogies that are poor. (Suppose I failed because the OP was the worst possible analogy, don't worry I'm sure it isn't; would the failure to supply one equally bad mean the OP was OK?)
Anyway if you insist:
Humphrey Litleton in ISIHAC is the master - explaination of the rules of "one song to the rules of another":
The teams are going to sing for us now, in the game called One Song To The Tune Of Another, and even as those words left my lips, I could sense the teams thinking: What in blue blazes is that all about? Well, fret not, as it's all relatively simple if given a proper explanation.
If you think about it, a milk bottle is almost exactly like a song. It's wide at the base, but tapers to a small diameter opening at the top which is sealed with a foil cap to prevent spillage. But that's not what makes it like a song. No, because the bottle contains milk which is exactly like the words. The milk, or words, may be poured from the bottle, or song, and then the bottle can be returned to the milkman to be refilled with different milk, or words. Just like singing one song to the tune of another. But, I hear the teams collectively gasp under their breath, what about garden birds? Yes, there is the danger as your milk sits on the doorstep, that the foil cap might have holes pecked in it, allowing the ingress of contaminent, and rendering the milk unpalatable. Sadly, things are liable to go sour, thanks to an unwelcome little tit. At the piano, Colin Sell...
Maybe a more realistic attempt:
"A child's mind is like an oak tree, if it is supplied with enough sunshine and watered from the sping of knowledge it will grow broad and healthy, producing acorns of wisdom which will then help to grow into a forest of human fulfillment".
Or the one that apathia provided earlier:
The atom is like a solar system, with the nuceus replacing the sun, and electrons replacing the planets.
This is a very common metaphor, and replaced the earlier "plum-pudding model" of the atom, which failed, when it was found that alpha particles tended to go straight through gold-foil without hitting anything solid.
This analogy has two good features:
Firstly it shows how the atom is mosly empty*, with the vast majority of the mass in the nucelus.
Secondly, it helped
lead to the deveolpment of quantum mechanics:
Hidden as it is a derail...
However you can see some of the problems with the analogy, and there are more too.
ETA
*sort of