You seem to obsess over such things.
Genetics and environment are not all separate.https://twitter.com/PaulB12104192/status/1177785834747158529 …
More recent discussions on etiology are more enlightening, of course 
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https://quillette.com/2019/09/14/there-is-no-gay-gene-but-sexuality-is-affected-by-many-genes-of-small-effect/ …
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https://quillette.com/2019/09/14/there-is-no-gay-gene-but-sexuality-is-affected-by-many-genes-of-small-effect/ …-
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Epigenetics is the study of how experiences and exposure during our lives triggers the flipping of genetic switches. Observation of phenotypic coevolution, or symbiotic relationships, indicates this process is common and can produce dramatic effects over generations.
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It is the environment itself that changes DNA bases, mostly by UV radiation, chemical agents, carcinogens, etc. Genetic expression is also different, not all genes serve as a single indicator for something but many are induced/inhibited by the environment in patterns.
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The function of one is to adapt to the other. Introduce intelligence to the equation and the environment can be adapted to suit genetics. When it comes to behaviour in social animals I suppose ethics becomes part of the environment within which the genes operate.
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