Sexual Attraction in Spyrogyra. This classic microscopic subject illustrates sex in lower organisms and shows the power of sexual attraction even in simple algae. One cell becomes quite amoeboid as it squeezes through the narrow fertilization tube that the partner cells have just built between them. The movie was shot in time-lapse over 2 hours. By Jeremy Pickett-Heaps, University of Melbourne, Australia. Third Prize.















