Homozygous exbakrasavietz mutants show reduced sensitivity to ethanol vapor compared with controls. exbakrasavietz mutant flies also show reduced rapid tolerance to ethanol. Whereas control flies exhibit a reduced behavioural response following pre-exposure to intoxicating levels of ethanol, exbakrasavietz mutant flies exposed to either ethanol or air produce a similar response. Chronic tolerance is also reduced; unlike in controls no change in behavioural response is seen following overnight pre-exposure to a low concentration of ethanol (never reaching intoxicating levels).
In memory tests, mutants perform at 96% of wild-type after a single training session, at 0% after spaced training.
Homozygotes exhibit severe defects in one-day memory after spaced training.
Etymology: Given the name "krasavietz", after one of Pavlov's dogs.