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Why some alleles are dominant and while other recessive,?

I would like to know what causes the recessive genes to suppressed in presence of dominant ?

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Generally, a recessive gene is a non functional gene.

Genes are DNA sequences which code for amino acid sequences. If a gene is recessive, this genetic sequence may poses a mis-sense (amino acid sequence altering) mutation. This mutation may lead to a non functioning protein. With the protein non functional, the observed phenotype is different from that which we observe with a functional protein.

It only takes one good copy of the gene to have the functional protein present in the organism. For this reason, it is dominant.

Reference: college