Polymorphic asynapses in different polytene chromosome regions. Variations in the appearance of the asynaptic region 73-74 of chromosome arm 5R: a) in B. carambolae and (b, c) in the B. dorsalis s.s. × B. carambolae hybrid. Minor asynapses in the B. dorsalis s.s. × B. carambolae hybrid within: d) regions 43 of chromosome arm 4L and e) regions 78-79 of chromosome arm 5R. Asterisks indicate the asynaptic regions. Scale bar represents 10 μm.