Why are certain genes recessive and others dominant?

Answer

Dear Arne

Yes, there is an explanation for this.

A gene is actually a piece of DNA that contains the information to produce a certain protein. There can be several variants (alleles) of one gene. Often one allele is dominant and another is recessive. In the vast majority of cases, the dominant allele will produce the protein with the correct structure. The recessive allele has mutated over time and does not contain the correct information to make the correct protein. A protein with an incorrect structure (i.e. not working or not working at all) is then produced or sometimes no protein at all.

So the dominant allele makes the correct protein, the recessive allele does not.

With best regards