The table below shows the results of a complementation test to try to discover how many different genes cause fruit flies to be wingless (winglessness is recessive to wild type). Each strain in the table is true- breeding wingless, and all pairwise crosses between strains are represented by "+" for complementation (offspring are wild type) or "-" for failure to complement (offspring are mutant wingless). In this set of strains, how many different genes can have recessive mutations causing winglessness? a) four b) three c) two d) one e) None of the above Strains 1 2 3 4 5 1 - + - + + 2 - + + + 3 - + + 4 - + 5 -
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