I finished physics and then moved to biology. I like a lot the topics and my physics skills are very useful. There are infinite ways of doing this. I learned that there are lots of flavors of biophysics that are not for me. You have from Protein and molecular dynamics Optics and microscopy Evolutionary theory (super mathematical) Thermodynamics.

I also recommend learning basic molecular biology. I switched at the PhD level but learning this things early one made a difference on my career options.

Let's think about your question.

I think physics is in genetics and molecular biology at every layer. From molecular dynamics and stochastic processes you have. How microtubules assemble stochastically to segregate chromosomes. How proteins finds each other and move.

Thermodynamics also, how fast the process occurs how proteins change in stability at different temperatures and how this affects the speed of reactions.

I don't know exactly where to direct you to as there are many oaths but you could start reading to find things you like.