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In color genetics, we often want to think of genes as switches that are either off or on and separate from one another. This is good for explaining simple inheritance and gives people with no background in genetics an easy introduction. However, when you start to learn more complex subjects like linkage, you have to understand that this is an oversimplified approach.
Gene are not simple, they are actually very complex. An average gene is made up of around 100,000 base pairs.
TYRP1 (tyrosinase related protein 1): As pigment develops, it follows a “pathway”. Think of it as a road or highway.