" What a coincidence ! I mean , how come that neither of my parents has the same type as mine , or either of my siblings . I thought that blood types and groups are inherited in the usual Mendelian way ?" Jason's questions repeatedly echoed through Mr. Potty's mind as he drove home . From his little biology , he knew that Jason was right , but Doctor Powell had given some other explanation for the disparity . He had talked about some mutational changes in the genetic constitution of an individual . Could it be the case with Jason ? Something in his heart told him that such a probability was quite minimal . Though he did not know about Jason's exact age , he approximated his birth to be within the year in which he had been arrested . He recalled that Maria , now Mrs. Jade , had been livi

