How does genetics effects speciation?

Genetics affects speciation mostly via mutation caused due to adaptation and environmental conditions.

Explanation:

The Speciation is defined as the evolution of a species into a distinct species. The cause of this could be several, and some of them could be environmental conditions, mutations, etc Environmental conditions include isolation of the species caused by mountain rise, river, flood etc. to survive they have to evolve or get adaptations to living in those conditions Mutation happens for many reasons, external factors can also cause the mutations to occur. It will also lead to speciation.