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So I've seen a lot of discussion among Gravity falls fans about Bill being possibly adopted, since he is yellow and his parents were blue and red. I think that this idea is kind of silly and I'll give you four reasons why it might be like that! Three of them are pure biology and fourth one is a little fucked up.
SPOILERS FOR THE BOOK OF BILL!
Reason 1: Yellow is a recessive trait.
We (unfortunately) don't know much about Bill's species, but since he has a mom and a dad, this means that they reproduce sexually. They receive one half of their genes (or their equivalents) from mom and the other from the dad. This is where recessive traits come into play: these are the traits that you won't exhibit, unless you have both copies, one from mom and one from dad. The opposite of them, the dominant traits, will show on you even if you have just one copy. In humans, O blood type is recessive, while A and B are dominant. So if you have gene A from one parent and gene O from another, you will be A blood type, since O shows only if you have two O genes.
In Bill's case, colors blue and red are dominant and yellow is recessive. So let's say that his mom was blue and had By genetics. His dad was red and he had Ry genetics. In gametes, these genes divide so his mom could pass on either her dominant blue gene, or recessive yellow and his dad could also pass his dominant red gene or yellow. So their child could have been:
BR = purple? (this is the equivalent of AB blood type)
By = blue
Ry = red or
yy = yellow - that's Bill :)
Reason 2: Sexual dimorphism
You probably know what is sexual dimorphism: that's just a sciency way to say that males and females look different. The traits that differ can be subtle, like size, or very apparent like beautiful tails of male peacocks.
In Euclidians, there could be association of sex and color. Males could be red, females could be blue, but maybe there were more options.
If this were true, then Bill is not male or female, he could be intersex, OR he could be male and one of his parents is intersex.
Reason 3: It's a part of his mutation
Bill was born with a very rare mutation that allowed him to look up. This basically means that he had to be inverted which makes me wonder how tf did he even survive. When kids are born with such serious mutations, they usually don't suffer from just one condition. In his case, his weird color could have been a result of that mutation interfering with his ability to produce pigments correctly.
Reason 4: THIS ONE IS FUCKED UP
Bill changes color depending on his emotional state. When he's angry he turns red for example. If he can do that, then it's fair to say that the rest of his species probably could too. Now, we don't know really if his parents were truly red and blue, we just know that that's how Bill draws them.
So... they may have been yellow, just like him, but changed their colors due to overwhelming emotions. Like when they were DYING. If this was the case, then Bill is actually drawing the faces of his parents in their last moments. That's the last thing that he's seen when he destroyed his dimension. That's the thing that bothers him the most. It would make sense.
So anyways, I hope you liked my analysis of this! If you have any more ideas, share them and thank you for reading :)
I cut a sticky note with a box cutter until it looked like art that could be posted.
WOAH WE’RE HALFWAY THERE
WOAH A DRY CLEANED BEAR
TAKE MY HAND,
WE’LL EAT CAKE I SWEAR
WOAH LIVIN’ ON A PRAYER
Allison and Lydia seeing the new kid.
How did this happened???
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fucked around and wrote a 26 page oneshot fanfic for my english class.
*brings you a half eaten bird and a dead mouse* Notice me mommy
Thank you little one, this will suffice perfectly.
My cat's favorite toy is this fake cigar with catnip in it. And it's created a thought I'd never thought I'd have.
Me: What she eating? Oh it's just the cigar. That's fine.