![Diagram explaning genotypes of lactose tolerance and intolerance](http://static.sciencelearn.org.nz/images/images/000/002/523/full/TH_FOODTO_INF_02_Genes_and_lactose_intolerance_IM02_Genotypes_v1.png?1674168298)
Most people in the world are lactose intolerant, but a genetic mutation where a cytosine (C) nucleotide in a person’s DNA is replaced with a thymine (T) nucleotide allows them to digest milk.
Most people in the world are lactose intolerant, but a genetic mutation where a cytosine (C) nucleotide in a person’s DNA is replaced with a thymine (T) nucleotide allows them to digest milk.