What inherent genetic characteristic causes the unpredictability in trait inheritance for a first-generation Yoranian cross?

Answer

High heterozygosity

The inherent unpredictability in trait inheritance seen in first-generation Yoranian crosses stems from high heterozygosity. Heterozygosity refers to having different forms of a particular gene inherited from each parent. Since the Yoranian combines genetic material from two distinct purebred lines (Yorkshire Terrier and Pomeranian), the resulting puppies may express a wide range of characteristics—from coat texture (wiry vs. fluffy) to temperament—which are difficult to predict because the genetic makeup is not fixed or homozygous for desired traits like in established purebred lines that have undergone generations of stabilizing breeding.

What inherent genetic characteristic causes the unpredictability in trait inheritance for a first-generation Yoranian cross?
taxonomyclassificationscienceYoranian