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The allele frequency cannot be determined because the equation for determining allele frequency is p^2+2pq+q^2=1. p is equal to the frequency of dominant alleles and q is equal to the frequency of recessive alleles. 2pq is the frequency of the heterozygous in the population. All you can determine from this is that 2pq=.42. You cannot solve for either p or q in this equation without knowing for information.