Question

two true - breeding guinea pigs were crossed. one had short, black fur, and the other had long, brown fur. fur length is carried on one gene and fur color on another. select all offspring phenotypes that you would expect in later generations if...
... the genes are nearby on the same chromosome.
short, black fur
long, black fur
short, brown fur
long, brown fur

Explanation:

When genes are nearby on the same chromosome (linked genes), they tend to be inherited together. The parental phenotypes are short, black fur and long, brown fur. Due to linkage, the non - parental phenotypes (long, black fur and short, brown fur) will be less frequent, but still possible due to rare crossing - over events. The parental phenotypes (short, black fur and long, brown fur) will be more common as the genes are linked.

Answer:

short, black fur, long, brown fur