Answer:
In pea plants, the colour of the flower is either violet or white because this trait is controlled by a single gene having two alleles, one of which (violet) is dominant over other (white). In the presence of dominant allele, the flowers will be of violet colour and in presence of both recessive alleles, flowers will be of white colour. Whereas, human skin colour is the type of inheritance that is controlled by one or more genes in which dominant alleles have cumulative effect. Each dominant allele expresses a part of the trait and the full trait is shown only when all dominant alleles are present. The quantity of human skin pigment melanin determines human skin colour which depends upon the presence of number of dominant alleles. So, the human skin colour shows many gradation.
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