Question

why some genes dominant and other are reccesive

Answer 1

It is due to the allele.i.e the position of locus on the chromosomes.

Answer 2

Answer:

The simplest situation of dominantand recessive alleles is if one allele makes a broken protein. When this happens, the working protein is usuallydominant. The broken protein doesn't do anything, so the working protein wins out. A great example of a recessive allele is red hair.