Having extra fingers (polydactyly) is a dominant trait. Having just 10 fingers is a recessive trait. How can you explain that almost (if not everyone) you know has the "normal" number of fingers? Look at the list of dominant vs recessive genes and give another example of a recessive gene being more common than a dominant one and explain why you think that dominance or recessiveness is not related to how often a trait occurs in a population

Explanation:

Polydactyly is a mutation, it is a sudden change that can be heritable that occurs.

Because mutation does not always occur the chances of having large number of people having the traits in a dominant form is low, hence more people will have normal finger.

Dominance is not the number of time a traits occur, it is the ability of a allele to be expressed over another. The expressed allele i.e that is seen in the phenotype of such individual is the dominant allele while recessive allele are the one whose effect are mask.

Having a round eye is an example of a recessive traits that people posses but are expressed in some individual.

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