A 2monthold boy with failure to thrive is seen in the genetics clinic for evaluation and counseling. He has poor suck, and his parents have to wake him to feed during the night. He has hypotonia and genital hypoplasia. Which of the following mechanisms is the MOST likely cause of this condition?
A. chromosome deletion
B. uniparental disomy
C. imprinting mutation
D. trinucleotide repeat