The process of crossing over in gene recombination and meiosis results in a new allele formation called combinative diversity.
New trait is formed by the new gene combinations and interactions.
There is an inheritance of combinative diversity according to Mendel’s Laws.
On gene expression in combinative diversity, the interaction of allelic and non-allelic genes: pleiotropic gene action, gene linkage, gene expressivity, penetrance, and so on have the influence factors.
This diversity is helpful in producing a variety of traits.