Final answer:
Based on genotype frequencies provided and in the absence of specific fitness values, 'aa' with a frequency of 85 likely has the highest selection coefficient, indicating it is under greater selective pressure compared to genotypes 'AA' and 'Aa'.
Step-by-step explanation:
The question of which genotype has the highest selection coefficient can be addressed through an understanding of population genetics. The selection coefficient (s) is a measure of the relative fitness of a genotype compared to the most fit genotype in the population. The higher the selection coefficient, the greater the selection against that genotype.
When we evaluate genotype frequencies, we typically assume that the genotype with the highest frequency in a stable population is the one with the lowest selection coefficient (i.e., it's the most fit). The frequencies given in the table are AA- 111, Aa- 123, aa- 85. To determine which has the highest selection coefficient, we need to compare not just the raw frequencies but also the relative fitness.