Final answer:
To determine the genotype of a black, short-haired animal, it can be crossed with an animal of a known genotype. By examining the traits displayed in the offspring, the genotype of the black, short-haired animal can be determined.
Step-by-step explanation:
In this scenario, we have two genes, one for hair length and one for hair color. Short hair (L) is dominant over long hair (l), and black hair (B) is dominant over brown hair (b). If we find a black, short-haired animal, we can determine its genotype by crossing it to an animal with a known genotype. Let's say the animal we're crossing it to has a genotype of ss bb (brown, long-haired). One possible outcome of the cross could be Ss Bb (black, short-haired), which would indicate that the black, short-haired animal is heterozygous for both traits.