Genetic abnormality and Lactase deficiency

Genetic abnormality noun - A disease or disorder that is inherited genetically.

Lactase deficiency and genetic abnormality are semantically related. In some cases you can replace phrase "Lactase deficiency" with "Genetic abnormality", this phrases are similar.

Lactase deficiency noun - Congenital disorder consisting of an inability to digest milk and milk products; absence or deficiency of lactase results in an inability to hydrolyze lactose.

Genetic abnormality and lactase deficiency are semantically related. You can use "Genetic abnormality" instead a noun phrase "Lactase deficiency".