Discussion
The Sewall Wright effect occurs because of :
Answer: B
The Sewall Wright effect occurs because of a decline in population.
The Sewall Wright effect is another name for genetic drift: random changes in allele frequencies from one generation to the next because only a sample of the gene pool is passed on. Its effect is strongest in small populations, so a decline in population size, as in a bottleneck or a founder event, makes drift important and can fix or eliminate alleles by chance alone.
Mutation creates new alleles but is not what drift means, a large or increasing population weakens drift, and variation is the raw material on which drift acts, not its cause.
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