What fundamental genetic difference is suggested to prohibit interbreeding between *Urocyon* and *Vulpes* species?
Answer
A different number of chromosomes
Analyses suggest that *Urocyon* species possess a different number of chromosomes than *Vulpes* species, which is a fundamental genetic difference confirming their status as distinct genera.
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To which genus does the gray fox (*Urocyon cinereoargenteus*) belong?Which genus encompasses the animals commonly referred to as "true foxes," such as the red fox and swift fox?What remarkable physical adaptation sets the gray fox apart, enabling it to escape certain predators?What reliable field mark distinguishes the gray fox's tail tip coloration from that of the red fox?How is the gray fox's typical body build often described when contrasted with the lean red fox?Which ecological niche do gray foxes primarily inhabit, aligning with their climbing capabilities?What is the characteristic visual appearance of the gray fox's coat coloration?The gray fox's genus, *Urocyon*, contains one other world species; what is it?What fundamental genetic difference is suggested to prohibit interbreeding between *Urocyon* and *Vulpes* species?Why is the gray fox considered evolutionarily distinct from the *Vulpes* group according to its lineage placement?