How do I unlock the Modify Genetic Codes without buying them?

In Plague Inc there are 25 genes to discover (5 per spot) that you can use prior to launching the game that gives you a boost / alters the gameplay.

It says:

"You can discover all of these genes - just by playing the game".

What in game combinations or actions trigger these Gene unlocks?

What in game combinations or actions trigger these Gene unlocks?

Beating the game

Any time your virus/bacteria/etc. succeeds in wiping out humanity, you will get a random gene unlocked. So far as I've been able to tell, there is no way to influence which genes get unlocked; you just have to keep playing until you randomly receive the one(s) you most want.

Also, as @Studoku pointed out in the comments, you must have already purchased the game to use any genes; they simply will not unlock in the unpaid trial. And to further clarify that, you have to buy the game itself, and then you have the opportunity to unlock genes by either spending more money, or playing the game -- there's "freemium", and then there's this, where you have to pay to have the privilege of paying for more!

With the latest upgrade I've finally been able to insert genes by simply watching 30 second game ads...just try your unlocked genes and continue unlocking new ones.