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For an evolutionary biologist, homosexuality is something of a puzzle. It appears to be run in families, suggesting that it is hereditary, at least in part. And yet it defies the very reason why traits are passed on from generation to generation. Love poem in hindi written in english.
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Parent article: List of gay, lesbian or bisexual people ; Siblings:. The historical concept and definition of sexual orientation varies and has changed greatly over time; for example the word "gay" was not used to describe sexual orientation until the midth century. Significado de biodegradable yahoo dating.
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No "gay gene" has been found to explain homosexuality, but a recent analysis published by The Quarterly Review of Biology suggests a new theory: The trait could be due to changes in the regulation of genes in the womb, and not the genes themselves, and could be passed down from parent to child. Studies clearly show that homosexuality runs in families, with an increased rate among siblings and the maternal uncles of gay men, so naturally many people think there must be some "gay gene" or combination of genes that controls the behavior. Dating on earth turkce altyaz l full izle.
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