if the female mouse/ hamster is a heterozygous and the male mouse/hamster is homozygous or vice-versa, what trait would be dominant?

The gender has little, if anything, to do with most genes.

So it depends on the homozygous individual. Is he homozygous dominant or homozygous recessive? If he is homozygous dominant, then the offspring will all display the dominant trait. If he is homozygous recessive, 50% of the offspring would display the dominant trait, and 50% would display the recessive trait.

The terms homozygous and heterozygous refer to the traits that are inherited from each parent. A mouse that is homozygous for a trait has inherited one allele from each parent for that trait. A mouse that is heterozygous for a trait has inherited one allele for that trait from one parent and an alternative allele from the other parent. If the trait is homozygous and the alleles are both recessive, the offspring will have a 100% chance of inheriting that trait. If the trait is heterozygous and the other parent does not carry that allele, the offspring have a 50% chance of getting that trait. pets question and answers,www.5d2d.com

Dominant does not mean a trait is stronger than a recessive trait. It just means the trait is visible.

TFM is my favorite mouse site. It has a wealth of information from A to Z on mice. Following is the link to their genetic section:

http://www.thefunmouse.com/varieties/gen…

I hope the information you read at the above site will be helpful. All the best with your animals.