Dr Tatianas Sex Advice To All Creation – Olivia Judson

But in the case of homosexuality, it is hard to imagine how, with respect to natural selection, the benefit from being a heterozygote could be large enough to compensate for a certain number of your offspring being sterile. Third, it is unlikely that homosexuality is controlled by a single gene. I can imagine one other way that genes for homosexuality could be directly favored by natural selection: through an insidious and fundamental form of conflict between the sexes.

Namely, if there are genes that produce homosexual behavior in members of one sex but confer great reproductive success on members of the other. From a theoretical point of view this could work. We know that genes that are beneficial in one sex can spread, even if they are detrimental in the other. Under some circumstances such genes can spread even if the benefit to one sex is small while the detriment to the other is large.

Thus, suppose a gene causes exclusive homosexuality in males but unusual fecundity when it occurs in females. The gene could persist—and perhaps even spread—despite its reproductive disadvantage in males. The more genes are involved, the more plausible the mechanism becomes. It would also then follow that male homosexuality and female homosexuality are due to different sets of genes. But forget theory. What about data? Although the results do not pertain explicitly to homosexuality, there is experimental evidence that sets of genes beneficial in one sex can be highly detrimental in the other.

As usual, the study animal was the fruit fly Drosophila melanogaster. Using the latest genetic wizardry, scientists were able to arrange for eggs from different females to be fertilized by males bearing genetically identical sperm. When the eggs hatched, all the fruit flies, both males and females, thus had one set of genes in common and one set of genes different.

Comparing these flies with ones drawn at random from the regular population, the scientists were able to evaluate whether possessing a given set of genes is beneficial, first with respect to succeeding as a larva (measured by whether you make it to adulthood), and then with respect to succeeding as an adult (measured by how many offspring you have). The scientists tested forty different sets of genes. The results were striking.

Ever wondered why sine women bite off your head, or why some guy always gets all the girls? Ever pondered why some men bring you balloons while others leave you their genitals? Dr Tatiana’s Sex Advice to All Creation is the book for you. Quiry, entertaining and brilliant, Dr Tatiana, the racy new agony aunt, explains all this and much more. She discloses the best time to hae sex change, how to have a virgin birth, when to seduce your sisters or eat you lover.

She also discusses more mundane matters—such as male pregnancy, homosexual rape and the joys of a detachable penis. For Dr Tatiana, the first agony aunt learned in natural history and evolutionary biology, receives letters from creatures great and small who are worried about their sex lives. She cajoles, reproves and reassures hear anxious correspondents—whether they are lions or bedbugs, spiders or sea lugs, hyaenas or manatees—and reveals why they have the problems they do.

In giving her solutions, she explains the evolutionary biology of sex, from Darwin’s theory of sexual selection to why sexual reproduction exits at all. This book is a fusion of science and natural history, a blend of wit and rigour that will fascinate and inform. OceanofPDF.com Olivia Judson Dr Tatiana’s Sex Advice to All Creation The Definitive Guide to the Evolutionary Biology of Sex ePub r1.0 Titivillus 17.12.17 OceanofPDF.com Olivia Judson, 2002 Editor digital: Titivillus ePub base r1.2 OceanofPDF.com For Ho­race, who taught me to write OceanofPDF.com AGONY AND ECSTASY: A NOTE FROM DR. TATIANA In my business I get asked a lot of questions.

Many of them concern matters beyond the wildest human imaginings. But the most common question is mundane enough: Why did I become a sex expert? Quite simply, I decided to dedicate myself to sex when I realized that nothing in life is more important, more interesting—or more troublesome.

If not for sex, much of what is flamboyant and beautiful in nature would not exist. Plants would not bloom. Birds would not sing. Deer would not sprout antlers. Hearts would not beat so fast. But ask an assortment of creatures, what is sex? and they will give you different answers.

This is a short excerpt from the opening of “” by Unknown, quoted for review and introduction purposes. All rights belong to the copyright holders.

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• Unique ID: 1770f8ac170bc197
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• Title: –
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• Pages: 292
• Language: English (en)

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