Doesn't matter since red hair allele is the most recessive of hair color, so if you have only one allele red hair, you will not have red hair.
Let's take that red hair allele is R, blonde is B, black is Bl and Brown Br, obviously it's simplified, there are more genes that affect it. If you have R-R you have red hairs and it's the only way to have it. If it's R-B, R-Bl or R-Br, you will have blonde/black/brown hair.
So let's take Nova's parents, they have black and white hair ( it's a color or age) and Nova is a redhead. The combination for black hair can be Bl-Bl, Bl-B, Bl-Br (not sure for this one) and Bl-R. All the combination will be a black haired person even if they have an allele for one of the other colour. We don't know the true colour of Nova's mother hair but it doesn't really matter.
The sperms and ovum will only be able to cary one of the allele. So the father create sperm that have the Bl allele for that we are sure. But since Nova has red hair she need to be R-R, it mean that her mother and father have to give her the allele R both. It mean that her father is BL-R and her mother ?-R. They can create sperm that are Bl or R and ovum that are ? or R, so the combination that they could have made are Bl-?, R-R and ?-R.