Brindle is a coat pattern that is characterized by stripes or streaks of a darker color on a lighter base coat. The brindle pattern is caused by a dominant gene, so if a puppy inherits at least one copy of the brindle gene from either parent, it will have a brindle coat.
White is a recessive color, so in order for a puppy to be white, it must inherit two copies of the white gene, one from each parent. If a puppy inherits only one copy of the white gene, it will have a coat that is a mixture of white and another color, such as brindle.
Black, fawn, and blue are all solid coat colors that can be found in pitbulls. The color of a puppy's coat is determined by the amount and type of melanin that is produced in its hair follicles. Melanin is the pigment that gives hair, skin, and eyes their color.
The genetics of coat color in dogs is complex, and it is not always possible to predict exactly what color or pattern a puppy will have. However, by understanding the basic principles of canine genetics, you can get a general idea of what colors and patterns are possible in a litter of puppies from two brindle and white pitbulls.