Thus the genetic basis to the origin of bird species is to be sought in the inheritance of adult traits that are subject to natural and sexual selection. ↗
Since childhood I've always had a tendency to lean towards melancholy. My sisters suffer from it too, so maybe it's a genetic thing. But none of us has ever been on medication. ↗
It's perfectly obvious that there is some genetic factor that distinguishes humans from other animals and that it is language-specific. The theory of that genetic component, whatever it turns out to be, is what is called universal grammar. ↗
For simplicity one can think of the + class as having one extra base at some point or other in the genetic message and the - class as having one too few. ↗
With our knowledge of modern-day genetics, we realize that it was possible for God to place the potential for all people throughout history into the genes of Adam and Eve when He created them. ↗
Another interesting field, which is my own, is cofactors, not only to the disease but also to transmission. I am still puzzled by the fact that you get more sexual transmission in some ethnic populations. One way to answer this is to look for genetic factors. ↗