Before revision: Reference needed Experiments involving crosses between D. pseudoananassae and D. bipectinata, D. pseudoananassae and D. parabipectinata, and D. pseudoananassae and D. malerkotliana have further shown that the Y chromosome has a role in hybrid male sterility.
After revision: (Reference needed) Experiments involving crosses between D. pseudoananassae and D. bipectinata, D. pseudoananassae and D. parabipectinata, and D. pseudoananassae and D. malerkotliana have further shown that the Y chromosome has a role in hybrid male sterility.