what non parental gene combination?????
When two genes are present in close association on the same chromosome, they do not segregate independently as per the Mendel's principles and are inherited into the offspring together. This is termed as linkage. So in such cases the gametes receive genes as were present in the parent referred as parental type gene combination. Thus parental gene combination refers to the same gene combination as present in the parents and non parental gene combination refers to gene combination formed after recombination i.e different combination of genes than present in parents.