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The allele - or group of genes - that sometimes codes for homosexual orientation may at other times have a strong reproductive benefit. It's not just the New York Times poll showing his new position to be a net loser. But since gay and lesbian people have fewer children than straight people, a problem arises. When a liberal goes through a similar gyration, he's said to have "evolved" into some more highly realized creature, deserving of a halo on the cover of a national newsmagazine. And even if heterosexual sex is more advantageous in evolutionary terms than gay sex, it's not only gay people whose sexuality is determined by their genes, he says, but straight people too. Every now and then a family member receives a larger dose that affects his or her sexual orientation, but the allele still has an overall reproductive advantage. There are two ways to defend gay marriage.

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The evolutionary puzzle of homosexuality

They concluded that the only possible model was that of sexually antagonistic selection. He was pro-gay marriage when running for the Illinois legislature from ultraliberal Hyde Park. True, he was rushed into it by his loquacious vice president. But since gay and lesbian people have fewer children than straight people, a problem arises. Another way a "gay allele" might be able to compensate for a reproductive deficit is by having the converse effect in the opposite sex. Since this only comes into play after several siblings have been born - most of whom are heterosexual and go on to have children - this pre-natal quirk hasn't been selected away by evolution. In the last two decades, dozens of scientific papers have been published on the biological origins of homosexuality - another announcement was made last week.

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The right to "marriage equality" is today's civil rights, voting rights, and women's rights — and just as inviolable. He was pro-gay marriage when running for the Illinois legislature from ultraliberal Hyde Park. Only the model of sexually antagonistic selection involving at least two genes - at least one of which must be on the X chromosome inherited in males only through their mother - accounted for all the known data. Politics Home Parliaments Brexit. The empathy argument both encourages mutual respect in the debate and lends itself to a political program of gradualism. These are external links and will open in a new window. No talk about rights, just human fellow feeling.

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