<prompt> All are seen in Fragile X syndrome exceptTesticular enlargement is seenCause of mental retardationTrinucleotide repeat mutations are presentGenomic imprinting  <response>: D- Genomic imprinting Fragile X-syndrome is trinucleotide repeat mutation disorder a CGG repeat Features: Enlarged mandible Macro - orchids Large eveed ears Mental retardation Other option B- Genomic imprinting is seen classically in Prader - Willi syndrome Angelman Syndrome. Prader - Willi Syndrome Angelman Syndrome Deletion of band q.12 on long arm of paternal chromosome 15. Genes in this region of maternal chromosome 15 are already imprinted. - complete loss of functions Deletion of same region form maternal chromosome., paternal genes on ch15 are imprinted MR, Sho-stature, hypotonia, hyperphagia, small hands feet hypogonadism MR, ataxia seizures inappropriate laughter 