Blue eyes are often a recessive mutation. However, it is likely that blue eyes are the result of more than one mutation affecting the eye. Which makes recreating blue eyed animals difficult, or what appears to be random.
Let’s elaborate/condense the definition of co dominance; try to view the lesser expressive phenotype as heterozygous, and the greater as homozygous.
A leatherback is simply a visual het of the greater silkie.
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