What are the similarities and differences between mutational and combinative variability?

Mutational and combinative variability are forms that are inherited from organisms, that is, they are passed from the current generation to the next generation. The mutational form arises in the course of errors and under the influence of mutagenic factors, it can be neutral, harmful and rarely useful. The changes brought about by mutational variability violate the usual order of the organism for various reasons; it represents a qualitative change in genetic material. Combinative variability is also inherited and manifested in all organisms; it consists in a random combination of gametes during fertilization and in the exchange of regions of homologous chromosomes during meiosis.