What about the sharing of genes by bacteria?
Could be a possibility.
Are plasmids the result of random mutation too?
Yes.
Is mutation only ever a random event?
Hmmm.
I think so. I suppose there could be some mechanism for inducing a specific mutation, but I'm not sure if this would still be considered a mutation or not.
Mutations are accidents in transcribing.
What's your definition of a "random" event?
Hmmm.
Who woulda thunk that we'd now need to enter a semantic debate about the word 'random'?
I certainly don't think that we could call that random, that's for sure.
Random, in terms of genetic mutation, is, in my opinion, defined by a lack of predictability in the outcome of a transcription.
I.e. you have a codon aaa. This should be duplicated but somehow (there are a large number of mechanisms by which this could occur) the codon becomes aat.
This is a mutation. And it's random because it could have been aag or aac instead.
It's not always entirely random as the various mechanisms by which these mutations occur sometimes limit the possibility for mutation.
For instance, there is the possibility that the original stretch of dna was aaagtc and the mechanism for mutation was that the third a was knocked out of the chain. Thus the new stretch would be aagtc. This would be one functional codon and one nonfunctional codon. Of course, the tc codon would, most likely, have another letter following it.
However, the randomness is increased as the particular mechanism of mutation is also somewhat random. An error in transcription. A free radical damaging the dna. Etc.
For example, is a shower of rain a random event
Hmm.
Somewhat. Weather can be predicted with reasonable certainty over short enough time spans.
However, where each individual rain drop will land can not.
is some stranger knocking on the door a random event?
It can be depending on your perspective.
For instance, if you looked outside and saw some strange dude standing in front of your door with his fist upraised preparing to knock, it would certainly seem to be out of place to say, "that was random" regarding the subsequent knocking. If, instead, he folded up your door like a piece of paper and blew his nose with it, you could rightfully call that random.
Yes?
Or is a random event something chaotic, and is a chaotic event different to a random one?
I'm tempted to say your semantic quandaries are random, but they seem as sure as day follows night.