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Question 1

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 ration had returned to nearly the expected 1:1. What caused this?

Answer 1

Evolutionary changes in the butterflies allowed the butterflies to suppress the male-killing effect of Wolbachia

Question 2

Fisher’s sex ratio model was put to test with a species of blue moon butterflies on the Samoan islands of Upolu and Savaii. Which of the following statement regarding that study are true?

Answer 2

A & B:

Originally, 99% of the butterflies were female and only 1% were male;
By 2006, the male:female sex ratio had returned to the expected 1:1