What is “gamete purity”? Can complete gametes contain genes from hybrid organisms?

The essence of the rule (principle) of “gamete purity” is a hypothesis put forward by G. Mendel (1865). The rule says that pairs of hereditary factors (in the modern formulation – genes) found in each organism do not mix and do not merge during the formation of a zygote.
During gametogenesis in the body of a hybrid, gametes receive one chromosome from each pair of homologous chromosomes, and, therefore, one gene from EACH PAIR of genes
the rule (principle) of “purity of gametes” serves as proof of the discrete nature of inheritance