CBS (8-9 p.m. ET)
Designer genes are the subject of this interesting documentary about the hereditary messages carried in the basic material of life. The force of heredity is illustrated by panning across the faces of 500 members of a clan. Rich Little lends a hand to science by imitating Humphrey Bogart. A voice-print of the two quickly exposes the phony Bogart—and the unique quality of each person's voice. The program also illustrates the dark side of heredity in a segment about a couple whose flawed genes could not produce a healthy baby.
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