The spelling of the word "yerkes" can be a bit confusing, but it follows the rules of phonetic transcription. The IPA transcription for "yerkes" is /ˈjərkiz/. The first letter, "y", represents the sound of the vowel in "yellow" or "yes". The "er" represents a schwa, a mid-central unrounded vowel, and the "k" sound is followed by an "s" at the end. The resulting pronunciation is "YER-keez". Overall, the spelling of "yerkes" follows the sounds that make up the word.