The ability of distinct dog breeds to produce fertile offspring like the Yorkie Bichon demonstrates what about their classification?
Answer
They share the same species designation (*C. l. familiaris*).
The fact that the Yorkshire Terrier and Bichon Frise readily mate to produce fertile, healthy offspring like the Yorkie Bichon confirms their shared scientific classification at the species level, *Canis lupus familiaris*. This capacity for interbreeding highlights their shared evolutionary history and close genetic relationship, differentiating them from crosses between different species within the *Canis* genus, such as a dog and a coyote, where fertility of offspring might be uncertain due to greater genetic divergence. The ease of producing viable offspring underscores that they are simply variations within the domestic canine lineage.
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