What affects mortgage rates? Talking points

I had received a comment in yesterdays post about the fed cut and mortgage rates. The question was if fed cuts don’t affect mortgage rates than what does? I was unsure on this one so I turned to the expert.
Darren Corder from Chase  had this reply for me.

How does the federal rate cut affect mortgages?

The Fed has cut rates by 75 basis points. These cuts in the federal funds rate does not neccessarily mean that mortgage rates will go down. Rates may go down after this week’s rate cut, but they also may go up, as they did after the Fed’s rate cuts in January cuts.
It is impossible to know what impact the Federal rate [...]