Bobin wrote:Gibbous Moon wrote:
Therefore the fact that homosexuality in humans exists means either one of two things. Either there is a gene (or a group of genes) for homosexuality and that those genes continue to be passed on and are therefore fit (adapted) to their environment or there is no gene for homosexuality and it’s learned or random behaviour.
All valid points. With the above, we must consider another possibility. Genotype and phenotype are not always directly correlated. The three possibilities are:
1. Expression of the trait purely due to genetic factors. Applied to homosexuality, this would incur no choice whatsoever on the part of the individual, much like someone cannot changes their eye color.
2. Genetic predisposition to the trait. In this case, the genetics exist to support the trait, but an environmental factor must also be present for the trait to be expressed. Many mental disorders, autoimmune disease, allergies, certain types of heart disease, etc., all fall into this category.
3. Non-genetic basis. Purely a learned behavior.
I have a tendancy to lean toward #2. Evidence supporting this view is the ability of a person to change their sexual orientation.
Scientific fact shows this is impossible.

