I was flicking through the Guardian today when I came across the "notes and queries" section in the G2. One of the queries rendered me actually, literally speechless - no mean feat (I learnt to talk at the age of one and apparently "haven't stopped since"). Alas, the query isn't up on the website yet so you'll have to take my word for it:
"Evolution is now well-documented and accepted, so if people kept jumping off the roof of a tall building, how long would it take before we developed wings to fly?"
Seriously?
Ok. A deep seated hatred of the kind of people who write into newspaper editorials actually prevents me from writing in to the section in question with my response, however it doesn't stop me from passive-aggressively ranting about it in my blog. Here is a highly simplified crash course on how evolution works:
Evolution is in its simplest form "survival of the fittest". The best adapted members of a species are more likely to survive and/or be chosen as breeding partners - meaning that they are more likely to pass on their genes to the next generation. This makes those favourable genes more common in each successive generation. As the process continues through the generations the "favourable traits" that led to the first individual's evolutionary success become more and more widespread until eventually they become "normal". I'm aware that my hastily noted ramblings may be confusing so let's use a totally fictional and rather extreme disease model to simplify things:
On planet Alex there are millions of bunnies (why bunnies? Because it's planet Alex. Deal with it). The bunnies all live in harmony on planet Alex, which is plentiful in food and free from predators, and are free to interbreed at will. Because of this there is a large amount of genetic diversity. Some of the bunnies have spontaneously mutated so that they carry gene X (note the "spontaneous" part. This is random people). At the moment gene X has no general effect on the population and so it is passed on from parent bunny to baby bunny with no real consequence. Until the plague comes.
(The plague has been brought to planet Alex by evil toad overlords who came for a two week holiday and then buggered off again)
The plague is fatal to the bunnies on planet Alex,
however it just so happens that gene X makes the bunnies that carry it immune to the plague. This is a total
coincidence. Pretty soon the entire bunny population has been wiped out by the plague, leaving only the bunnies with gene X alive. Because they are bunnies they set about repopulating planet Alex pretty sharpish. The result? Every in bunny in the population now carries gene X.
That was a very simplistic and entirely unrealistic scenario (in actual fact there are no bunnies native to planet Alex) but the basic point I'm making here is that evolution is a process that happens by
chance not by design. It is caused by the selection of existing genetic traits that have become favourable for survival due to a particular environment. It is
not caused by the actions of individual members of a species over time.
Taking the above example: people continually leaping from a roof top would not cause other members of the population to sprout wings, it would merely serve to remove those idiots who jumped off of buildings from the breeding pool.
And
that ladies and gents is why I'm going into science journalism.
The worst thing is when I told one of my co-workers that I'd seen something truly depressing in the newspaper our resulting conversation was as follows:
"You mean the thing I sent you?"
"Erm, what thing you sent me?"
"The thing with the scratchcards."
"What thing with the scratchcards?"
"The thing I sent you with the....Jesus, Alex. Try checking your work email."
"Ok, ok..... Oh, crap."
The little gem awaiting me in my inbox was
this. My favourite line of the piece?
""I phoned Camelot and they fobbed me off with some story that -6 is higher - not lower - than -8 but I'm not having it."
I'll be out back, researching tall buildings with roof access in my local area.