Genetics

An infant born to a 40-year-old female has a flat face, up-slanting palpebral fissures, a small mouth and a single palmar crease. On physical examination, the infant has a blowing holosystolic murmur heard best along the sternal border. Of the chromosomal abnormalities listed below, which is most likely to have caused the clinical findings described?
Partial deletion
Triplet expansion
Mosaicism
Genomic imprinting
Uniparental disomy
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