Approximately 20 percent of the world's adult population are able to digest milk sugar (lactose). they are "lactose tolerant." this trait is known to be controlled by a single dominant gene. therefore we would expect that :

a) all children of lactose parents will also be lactose tolerant.
b) no lactose tolerant individuals will be heterozygous for the gene
c) 60 percent of lactose intolerant individuals would be heterozygous.
d) ll lactose tolerant individuals to be heterozygous for the gene.