heterozygous

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Is this animal actually caring two different alleles (one bell, one graziani) for a single trait (pastel)? Or are the alleles the exact same?

If you can produce a "super" (homozygous animal) from a pairing of two animals who are heterozygous for a particular trait, it's the same gene -- as with your bell + graziani example.

If the offspring of two heterozygous animals produces a double-heterozygous animal, then they are passing on alleles from different genes -- ie. a cinnamon pastel + a lemon pastel