Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_84 (genes INTEGER, reference VARCHAR, strain VARCHAR)
### Question:
what is the average genes when the reference is 2009 and the strain is rku-1?
### Answer:
SELECT AVG(genes) FROM table_name_84 WHERE reference = "2009" AND strain = "rku-1"