Why A dog with brown fur breeds with a dog with gray fur. When the puppies are born three of the puppies have brown fur and one puppy has gray fur?

The fur color of the puppies is determined by the genetic traits inherited from their parents. The brown-furred dog likely carries genes for brown fur, while the gray-furred dog may have genes for gray fur. The dominant and recessive nature of these genes can result in a mix of fur colors in the offspring, which explains why three puppies have brown fur (possibly inheriting the dominant brown genes) while one puppy has gray fur (inheriting the recessive gray genes). This pattern of inheritance is consistent with Mendelian genetics, where traits are passed down according to specific rules.