Medical Genetics Hence the son will receive half of the father's tall genes, on average, and half of the mothers tall"genes, on average, but his total genes for" tallness, on average, will be less than his father'sMedical Genetics Hence, the son will receive half of the father's "tall" genes, on average, and half of the mother's "tall" genes, on average, but his total genes for "tallness," on average, will be less than his father's