Answer
You Have Red Hair: Genes
Soccer is your favorite sport: Jeans
You have dark skin and can tan easily: Genes
You can roll your tongue: Genes
You are a picky eater: Jeans
You speak Spanish fluently: Jeans
You are color-blind: Genes
You always complete your homework on time: Jeans
Your hair is dyed brown: Jeans
You have pierced ears: Jeans
You have freckles: Genes
You can play the saxophone: Jeans
You prefer sweet food over sour food: Jeans
You have blue eyes: Genes
Your blood type is O: Jeans
Explanation: I'm not really sure how to explain but I'll try. So if your hair is naturally brown it would be a gene because you are born with it. If you dyed your hair brown it would be a jean because it wasn't natural. For example if you have pierced ears it would be a jean because you were not born with your ears pierced.
Have a good day, hope I helped!