Abstract
Summary The swimming behaviour of dark-adapted Chlamydomonas eugametos cells in response to flashes or continuousgreen light was investigated. Both phototactic and non-phototactic gametes were analysed together with different combinations of fused gametes as vis-a-vis pairs. The movement of individual cells and whole populations was examined using a computer supported motion analysis system and a taxigraph. Cells exhibited stop responses, disoriented tumbling during light adaptation and positive phototactic swimming. The general photobehaviour of pairs was dictated by the swimming mt + cell independent of its mt - partner. Pairs adapted more slowly to light stimuli than their parents with each response phase being extended.
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