Psychology Homosexual

Gay genes on the X-chromosome
Exclusive crotchet is puzzling for evolutionary biologists because homosexuals leave substantially fewer offspring. Some marry out-of-pocket to social pressures and end up having children but many do not reproduce. Any genes predisposing to homosexual behavior would thus pop off excluded by inseparable selection. Current research implies male homosexuality is a sex-linked trait, although genes atomic number 18 far from being the on the whole story. (Female homosexuality is also heritable but less is cognise of the ge give the sackic mechanisms).

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sex-linked traits, such as color blindness highlight a curious chink in the armor of natural selection. In the normal course of events, any genetic trait that impedes excerpt or reduces reproductive success gets winnowed out by natural selection operating over many generations. Sex-linked traits are different because they are on the X-chromosome. Females are carriers of the affected genes (since fathers endlessly transmit Y-chromosomes to their offspring in the course of normal fertilization).



Females rarely manifest the sex-linked trait, however, because their second X-chromosome masks the mutated gene.

This fact opens up a genetic conflict of interest between the sexes. Why? Because a gene that is harmful to male reproduction can be retained by natural selection if it provides advantages to females. Indeed, if the reproductive make to females is greater than the cost to males, then lineages having the sex-linked gene volition out-reproduce those lacking it based on simple arithmetic.

A gene promoting male homosexuality could therefore slip through the net of natural selection. For this theory of male homosexuality to be credible, at least two criteria would have to be met. First, it would have to be demonstrated that male...If you want to get a full essay, articulate it on our website: Orderessay



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