What is the primary difference between orthologous and paralogous genes?

Paralogous genes are the result of speciation events, while orthologous genes are the result of gene duplication events.

Orthologous genes are non-homologous, while paralogous genes are homologous.

Orthologous genes and paralogous genes both result from gene duplication.

Orthologous genes are the result of speciation events, while paralogous genes are the result of gene duplication events.