You are studying a prickly pear cactus population. There are two alleles for spine length, L is dominant for long spines, and l is recessive for short spines. If the phenotypic frequency of short spines in the population is 0.1598, what is the allele frequency for the dominant allele (L)? In other words, what is p? Round your answer to the fourth decimal after each step.
Group of answer choices
p2
2pq
q2
(observed-expected)2
p+q