What happens to a trait when genes combine in different ways?

the dominat gene will always show because it is dominant unless the submissive/repressed trait it there as double. say we have Bb and bb as the genes, there is s 75% chance the dominant trait takes over while a 25% chance the submissive one is shown.

Explanation:

this is true, assuming that the allele is completely recessive and incomplete dominance is not a factor.