well the phenotype depends on which color Is dominant. if black is the dominant color than both of the rabbits will be black. if brown is the dominant color, both of the rabbits would be brown. since the female rabbit has the recessive trait of brown I am guessing, then one of the offspring will be the recessive color. the ratio to have a brown offspring is 25% out of 100 but the ratio of black it would be 75% out of 100