'Mork & Mindy' is a spin-off of which TV series?

'Frasier' is a spin-off of which TV series? 'Joey' is a spin-off of which TV series? 'Better Call Saul' is a spin-off of which TV series? 'Laverne & Shirley' is a spin-off of which TV series? 'The Jeffersons' is a spin-off of which TV series? 'Maude' is a spin-off of which TV series? 'Rhoda' is a spin-off of which TV series? 'Young Sheldon' is a spin-off of which TV series?