Among a large population of 2 million gray mosquitoes, one mosquito is heterozygous for a body color gene; this mosquito has one gray allele and one blue allele. There is no selective advantage or disadvantage between gray and blue body color. All of the other mosquitoes carry the gray allele.
A. What is the probability of fixation of the blue allele?
B. If fixation happens to occur, how many generations is it likely to take?
C. Qualitatively, how would the answers to parts A and B be affected if the blue allele conferred a slight survival advantage?