<prompt> A child with a small head, minor anomalies of the face including a thin upper lip, growth delay, and developmental disability can have all of the following, except:A chromosomal syndromeA teratogenic syndromeA Mendelian syndromeA polygenic syndrome  <response>: d. A polygenic syndromeRef: Nelsons 20e p 618-619The given child has microcephaly, thin upper lip growth developmental delay. These features can be seen in:a. A chromosomal syndrome like Tetrasomy 12p Pallister-Killian syndromeb. A teratogenic syndrome like fetal alcohol syndromec. Amendelian syndrome like Rubinstein-Taybi syndromeHence, a polygenic syndrome is least likely in the given scenarioIn a polygenic disease, multiple genes contribute to the disease like hypertension diabetes 