Read the following passage and answer if the question is true or false.
Passage: XYY syndrome is a genetic condition in which a male has an extra Y chromosome. Symptoms are usually few. They may include being taller than average, acne, and an increased risk of learning problems. The person is generally otherwise normal, including normal fertility.

Question: is it possible to have an extra y chromosome?

Is the answer True or False? Respond with only "True" or "False" and no additional text.
True.