Tomas has Prader-Willi syndrome,a consequence of a lack of inheritance of a particular gene or set of genes from his father.This is an example of

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Prader-Willi syndrome is caused by the lack of expression of certain genes on the paternal copy of chromosome 15 due to genomic imprinting. Genomic imprinting is a phenomenon in which certain genes are only expressed from one of the two parental copies, depending on their parental origin. This results in different gene expression patterns between the maternal and paternal chromosomes and can lead to various genetic disorders.

Tomas Has Prader-Willi Syndrome,a Consequence of a Lack of Inheritance