Stepwise mutation for drug resistance is seen with________?

Nasolacrimal duct is directed________?

In which of the following disorders a circulating antibody directed to intercellular cementing substance of stratified squamous epithelium is observed:________?

Fraction of CPK is an enzyme that is elevated in a myocardial infarct is________?

Brown tumours are seen in________?

Muscles of mastication develops from________?