Lactose tolerance is just a genetic switch that fails to turn off (usually the switch turns off after infancy).
The gene that produces the enzyme lactase (capable of breaking down lactose) is simply left on in adulthood. Evolutionists themselves acknowledge that no new information is being added. 1
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Dawkins, R. (2004). The Ancestor's Tale: A Pilgrimage to the Dawn of Evolution. Boston: Houghton Mifflin.
- Dawkins, 2004, p. 31: “Young mammals switch off the gene that produces lactase after they pass the age of normal weaning. It isn’t that they lack the gene, of course. Genes needed only in childhood are not removed from the genome, not even in butterflies, which must carry large numbers of genes needed only for making caterpillars. But lactase production is switched off in human infants at the age of about four, under the influence of other, controlling genes.” ↩