Given a scientific question, generate a correct answer to it.

Example Input: What kind of rock is gypsum?
Example Output: sedimentary

Example Input: What is the place called where the axon of one neuron meets the dendrite of another?
Example Output: synapse

Example Input: What term describes a gene or sequence on a chromosome that co-segregates (shows genetic linkage) with a specific trait?
Example Output:
genetic marker