Last night the dinnertime conversation turned to the subject of evolution. The question that started the ball rolling was, “Dad, if human beings hadn’t evolved what sort of beings do you think would have taken our place as the intelligent life form on the planet?”
As if I need to tell you, we have two teenaged boys.
We quickly got past talking about dog-people and lizard-people and bird-people---I’m in the bird-people camp. Complex communication skills. Opposable thumbs on early winged bird ancestors. And being able to fly would be really cool---to talking about how evolution has actually worked. Stephen Jay Gould’s name came up along with terms like punctuated equilibrium and contingency.
Ok, Gould’s name didn’t just come up. I brought it up. I think you can’t talk about evolution anymore without bringing up Gould, which is probably a literary judgment more than a scientific one. Just about everything I know about evolution I know from reading his essays. But I had Gould on my mind already. Recently, over at the Daily Dish, Andrew Sullivan linked to an interview at Salon with neuroscientist Simon LeVay, who has written a book called Gay, Straight, and the Reason Why: The Science of Sexual Orientation
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It’s an interesting interview but it was ,the title Sullivan gave to his own post linking to Salon that started me thinking of Gould: If Gayness Is Genetic, Why Doesn’t It Die Out?
Sullivan admits to titling the post that because it’s a common question, not that he thinks it’s an intelligent one. He dismisses the question himself as “a dumb one for anyone with even a small grasp of evolution and genetics”.
I don’t think it’s a dumb question, necessarily. I think it’s a naive one. But it depends on who’s asking.
A couple of kids who are trying to imagine how a world full of dog-people or lizard-people or bird-people might have evolved, for instance.
I’m going to leave aside for now the fact that we don’t actually know gayness is genetic. Some biologists think that a gene or a sequence of genes that can be associated with homosexuality may have been identified. What we do know is that most gay people don’t feel they had a choice about their sexual orientation any more than they had a choice concerning their hair color, height, or gender. As soon as they became aware of themselves as having sexual urges they were also aware that those urges were attracting them to members of the same sex.
Which makes sense to me, based on my own experience.
I became aware of myself as having sexual urges at the very moment I became aware of thinking Lois Lane was pretty hot stuff.
I used to wonder how anyone who was straight could believe that some people chose not to be. Besides the sad fact that, as so many gay men and women have pointed out, choosing to be gay is practically suicidal and if they’d had the choice they’d have chosen to avoid the heartbreak, ostracism, loss of the love of parents and friends, and the attendant guilt and self-loathing that comes from believing, despite knowing better, you have become some sort of freak or devil, did these straight people believe they had made a choice themselves?
Was there are moment in junior high when they said to themselves, “Wow! Todd has such broad shoulders and he’s so big and strong and handsome I just want him to sweep me up into his arms but Susie has a great pair of knockers! Hmm…Shoulders? Knockers? Knockers? Shoulders?”
I’ve since come to understand that a lot of straight people are actually “straight” and they did have that debate with themselves. And they didn’t choose to be straight. They chose not to be gay or, rather, chose not to let anyone else know they were. They made the choice to force themselves to act heterosexual to the point of getting married to members of the opposite sex and having children with them.
“I can’t be gay if I’m somebody’s biological parent. Can I?”
Which offers an answer to the question right there.
In societies where homosexuality is taboo, anyone who wants to preserve his or her place in their society will “choose” to be heterosexual. Babies carrying a parent’s gay genes will get born.
The answer is, in effect, the closet.
It’s Ted Haggard and Larry Craig.
But there are some other untenable assumptions behind the question and any answer that isn’t some form of “the closet.”
One is that all genes are passed along generation to generation directly by people in whom those genes are manifest. Or, to put it simply, that parents with brown eyes will inevitably and only produce brown-eyed offspring.
A corollary to this is the assumption that people don’t carry any more genes than they need to be who and what they are, that brown-eyed people don’t carry any blue-eyed genes.
What’s not being assumed is what is in fact the case, that individuals carry pretty much every variation of human shape and form and style and pass those variations along, even the variations that haven’t shown up in generations, and that this can go on for many more generations before, with seeming inexplicability, a blue-eyed child is born into a family that had produced nothing but brown-eyed sons and daughters for hundreds of years.
Which is to say you don’t have to be gay yourself to pass along the gay gene (if there is such a single thing), just as you don’t have to be red-headed or left-handed and good at hitting baseballs yourself to have a red-headed, left-handed kid who grows up to lead the league in home runs, from which it follows that you don’t have to be straight to pass along the straight gene, and won’t a lot of homophobes be surprised as it becomes more accepted for gay people to marry and start families that openly gay couples who choose to have babies that carry their own genes will produce a generation of biological children that will include the same percentages of gay and straight people as the population at large?
Reminds me. I can’t wait for The Kids Are All Right to come out on DVD.
Another untenable assumption behind the question is that people have always been able to choose whether or not to pass along their genes.
Which is just not true. Not for one half the population, at any rate.
To put it bluntly, for most of human history human females did not have much choice in whether or not they would bear children or even in who else’s genes their children would carry.
In many societies today they still don’t have much of a choice.
At any rate, this all boils down to saying that the gay gene or genes haven’t died out because straight people and gay people trying to be straight or forced to be straight in the limited sense of having to bear children have kept passing them along.
But there’s one more assumption, and that’s the one that had me thinking about Stephen Jay Gould.
It’s no use trying to answer the question as if there’s an evolutionary explanation for everything about us.
If you go looking for an evolutionary benefit to the survival of a gay gene, you are assuming that things always evolve to a purpose.
Now, from here on out, keep in mind that I’m not a biologist or a science journalist, and it’s been a long time since I read Ever Since Darwin
and I wasn’t able to lay my hands on my packed-away-in-one-of-a-dozen-boxes-in-the-garage copies of it or The Panda's Thumb
before sitting down to write this, and I first read them when I was young and naive myself and may be remembering it all wrong even if I understood it all correctly to begin with. This post is an attempt to remind myself what it is I do know and I’m counting on those of you who know better or understand these ideas more fully to correct me.
One of the first things I learned, or think I learned, from reading Gould’s essays is the concept of contingency.
Some things happen because they don’t get in the way of other things happening. They’re accidents without harmful consequences.
If I go to the store to buy a quart of milk and the clerk talks me into buying a lottery ticket that hits, it’s not the case that my buying a quart of milk made me a millionaire.
My becoming a millionaire was contingent upon my needing to buy milk.
Humans as a species hit the lottery when they figured out how to manipulate their world by using tools. They were able to use tools because they had opposable thumbs, but that doesn’t mean they evolved opposable thumbs in order to be able to use tools.
They didn’t have opposable thumbs because they used tools, they used tools because they had opposable thumbs. Tool using and tool making and all the craftsmanship and art and engineering that has followed since are contingent upon us having opposable thumbs.
And, looking at the fossil record, it appears that opposable thumbs themselves aren’t an evolutionary specialization but the record of a failure to specialize. Some early mammals failed to evolve wings or hooves or claws or fins and had to make do with hands.
Not everything about us evolved because it conferred a biological advantage. Some things evolved because there was no disadvantage. Human beings have been able to find a use for or an advantage in contingent features of our overall humanness. That’s what makes us human, the ability to make do, not the feature we’ve made do with.
We didn’t evolve in very specific ways to fit our niche. We don’t have a niche so we didn’t need to. That particular quirk in our make-up may be contingent upon a whole lot of evolutionary advantages or all our other advantages may be contingent upon it. We don’t know because we don’t have the genetic evidence yet.
What we can be fairly confident of is that that quirk meant that our early ancestors didn’t have to be quite so selective about what genes they handed down. A whole lot of things about us could survive without necessarily being among the “fittest.” The whole damn species could survive, has survived, while being obviously not among the “fittest.”
I’m using “fittest” here as most people understand it---or rather misunderstand it---and not as Darwin meant it.
Sullivan speculates that there might have been an advantage to a culture or a tribe or a family to having members who were not interested in bearing or raising children of their own:
They might help advance a society's education, or become spiritual leaders, or be warriors unaffected by the need to take care of a household.
I can see that.
I know a gay man who because he has no biological offspring of his own has been enlisted by quite a number of his straight friends as an uncle to their children. He is a teacher, a protector, a role-model, and a source of love and care to more children than I am, because he has more time and freedom to spread his love and protection around.
But that doesn’t mean that Uncle Merlin exists as a result of a specific evolutionary purpose.
It’s more likely the case that wise societies knew enough to take advantage of their Uncle Merlins.
We don’t know---yet---how it’s worked itself out on the genetic level. It may be that whatever gay gene there is, if there is a single, separate gene, is contingent upon some other more evolutionarily purposeful gene.
Very simply, the genes that give human beings the ability to make clothing may be sequenced with genes that give them the ability to take pleasure in making those clothes pretty, and if there’s no evolutionary advantage in being able to take that pleasure---and I’m not saying there’s not---there’s there’s no evolutionary disadvantage in it either, for the species or the individual.
Gay genes---gay human beings---may have survived despite the lack of inclination to pass those genes along in the usual fashion because there’s nothing to stop a human being who happens to carry those genes from surviving and thriving…except the interference of other human beings.
All in all, it was an interesting and lively time in the Mannion kitchen last night. I was impressed by how much the guys know already. Means their schools haven’t been falling down on the job of teaching science, for one thing. But I was also pleased at how comfortable they are living in a world that operates according to processes that can be figured out and explained and even directed by human beings, as opposed to one that exists by magic.
But I also couldn’t help shaking my head sadly over the fact that at other kitchen tables across the country similar discussions were taking place except that after the question, “Dad, if human beings hadn’t evolved, what sort of beings do you think would have taken our place as the intelligent life form on the planet?” the course of the conversation was set by the answer, “That would never have happened, son. God created people because he wanted someone to talk to and that’s why he made us in His image.”
And we know where that one is likely to go if the subject turns to the survival of a gay gene.
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