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Pony Genetics: What race will Cadence and Shining Armor's foals be? 423 To speculate on this, we must first know how defining this, so let's use the Neson Theory of Pony Iaheritence put forth by brony Griffin U/u P/p In the Nelson Theory, there are three genes in Pony DNA that ultimately define the Pony's apparent race. Each gene is made up of two allels, one inherited from each of the Pomy's parents. There are two versions of each allele. The DOMINANT version and the RECESSIVE letters and recessive allels with lowercase letters. All ponies have all three of these genes. The Pegasus Gene (P/p), the Unicorn Gene (U/u), and the Expression" Gene (Ele). We will explain the Expression gene in a moment, For now, let's focus on the other two. The deminance of the Pegasus and Unicon genes determines the pony's visible race Ponies with more dominant Unicom Ponies with more dominant Pegasusos with equal Pegaus and Unicorn allels than Pegasus allels are Unicoms allels than Unicoen allels are Pagasi Fluttershy's staring power revels an inherent magical ability, meaning she has a dominant unicorn Allele. She must be Uu PP. Pinkie's psychic also reveal unicom magik, meaning she must be Uuor U PP Mr. and Mrs. Cake are both Earth ponies, but their children are a unicorn and a pegasus, How can this be Here is one of many possible genetikc scenarios: The Expression Gene defines how strongly the other genes come in to play Expression is caried on the recessive allele. This means that a Pony with even one dominant expression gene will be "Expeession Negative. To be "Expression Positive" a pony must have both Expression allels be recessive. This is very rare. Expression Positive (E+) ponies have greately increased natural abilities. Twilight Sparkle is definitely an Expression Positive Unicorn. Her magical abilities are only rivaled by Pegasus. Her raw flying abilities are far better The expression gene is also how we get Alicorns, In order for a pony to be born an Alicon, it must have fully dominant Pegasus and Unicom genes, as well as being Expression positive Alicorns are incredibly rare. If the allels were evenly spread throughout the population, one in every 64 ponies would be an the genetics are not evenly divided. The expression gene is very rare. Also, interbreeding between Earth Ponies, Pegasi, and Unicons only began in the recent era. Before that, they interacted little, making it very rare for any pony to have mixed heratage. As time moves forward, Alicoens will become more common. Princess Cadence is an example of the The historical princess who wes aficted by the first To know what Shining Armor and Cadence's foals will be like, we must first figure Shining Armor's incredibly powerful magic makes it clear that he is an figure out. She's an Alicorn, soExpression Positive Unicorn (like his sister) This means he is one of the following: pp ee, U Pee, or Uu ppee The three possible genomes for Shining Armor are not equally likely, In a random population, UU Paee is twice as likely as the other two. So it will be weighted accordingly in the final cakculations ERee ses 62.5% 25% 12.5%

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