You conduct an experiment in which you raise six replicated lines of fruit flies for eight generations. You keep population size constant at 20 adults per generation. You are interested in a gene, bw, that affects eye color. This gene has two alleles, bw-1 and bw-2. You start each replicated line with the frequency of the bw-1 allele at 50 percent. Do the data in the graph better match the prediction for the bw alleles evolving by genetic drift or by directional selection? Be sure to define directional selection and genetic drift and describe the prediction of both hypotheses. 
Definitions:
Domestic Partnership
A personal relationship between two individuals who live together and share a domestic life but are not married.
Committed Relationships
A relationship where individuals agree to be with each other exclusively and work together on building a future.
Gay Men
Refers to men who are romantically and sexually attracted to other men.
Cohabitation
The condition of cohabitation with a partner in a sexual relationship without the formal union of marriage.
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