Genetics Edutainment

I am producing a genetics educational game with an emphases being a fun game and having accurate science. It will be a a free online game based on breeding animals. I was wondering if you could tell me what do you wish people already knew when you first talk to them about genetics to them? For example

-XY sex linked genes

-dominant/recessive genes

-terminology such as homozygous, heterozygous.

-that some non obvious traits such as eye defects and coat color are related.

-linkage distance between genes.

-some thing else completely different.

I am looking for which points I should emphasize in the game.

I have put a facebook page, a feedback page to track suggestions and a demo working game screen for those interested.

https://www.facebook.com/MendelsDragonIsles

http://mendelsdi.uservoice.com/forums/168734-general

http://gran08.wix.com/crossplatformcoding#!mendels-dragon-isle/c1y3f

Cheers,

Grant morgan

P.S. sorry if I was not supposed to cross post I was not sure if education or genetics was more appropriate