Tongue rolling ability is conferred by the presence of a dominant R allele. Nonrollers are genotype rr. A class of Genetics students consists of 299 rollers and 48 nonrollers. Assume that this population is at Hardy-Weinberg equilibrium for this locus.
Please round all answers correctly to 4 decimal digits.
What is the frequency of the r allele?
A. 0.1695
B. 0.1978
C. 0.2261
D. 0.2543
