Studies looking at the genetic change in adults have produced conflicting results on the effectiveness of salbutamol in older patients, he added.

Modern biotechnology allows scientists to achieve this genetic change in more targeted fashion.

This process, called transposition, occurs naturally but infrequently in cells as a means of genetic change.

That makes it hard to care about the intricate details of genetic change that took place during domestication.

In addition, heritability can change without any genetic change occurring (e.g. when the environment starts contributing to more variation).