Hi .. I mean we all evolved from creatures that have less genes than we do .. So it must be duplicated and had mutations again .. But my question is the next "is there any experiment or evidence that proves this process?"
Thank you ..

your statement is incorrect. many animals and flowers have many more chromosomes and/or genes and/or size of the genome than humans.

Not sure I fully understand the question, but in addition to David's point, there is certainly very strong evidence of polyploid events in many lineages. These can (roughly!) be viewed as events in which the genome is doubled in size (or more correctly the number of chromosomes increases by a factor of n where n is the haploid number of chromosomes).

Some info here
https://en.wikipedia.org/wiki/Polyploid

Recent occurrences of polyploidy are well documented in many plant systems (see examples in wiki page) and some fish groups (e.g. salmonids). In deeper evolutionary time a polyploid event is also implicated in the ancestral lineage of tetrapods. Some links to more technical summaries may also be of interest although you will probably have to e-mail the authors if you wnat more than the abstract (the rest will be behind  a paywall)

http://www.annualreviews.org/doi/full/1 … t.34.1.401

http://link.springer.com/article/10.102 … 2652814749