During the observations of a species of blue moon butterflies on the Samoan islands of Upolu and Savaii,

99% of the butterflies were originally female and only 1% were male but in only five years the male:female sex ratio had returned to nearly the expected 1:1. What caused this?
a. The tendency for Wolbachia to kill male butterflies changed.
b. Evolutionary changes in the butterflies allowed the butterflies to suppress the male-killing ef-fect of Wolbachia.
c. A and B.
d. Neither A nor B.


B

Biology & Microbiology

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