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Quite a few studies have concluded that the blood types of the mother and the fetus can affect the chance of a spontaneous miscarriage , several have inferred selection against the A allele , and at least one study suggested that natural selection would favor a male population with high frequencies of the O phenotype ( because the fetus would have an ABO phenotype similar to the mother 's ) . The liquor man tries to convince me to come in , because he will trade booze for cute girls . In addition , the number of change of assignment students from the Commonwealth Campuses has continued to decline slightly each year . However , for the purpose of your answer , I am only going to focus on the alleles of the ABO locus ; just remember that some people who seem to have the O phenotype are actually non-secretors who would otherwise ( if they were secretors ) have A , B , or AB phenotypes . This means that the O phenotype is a recessive Mendelian trait and , your question becomes , why has the frequency of the non-functional O allele risen over the course of the history of the human species ? " As usual the Pageant promises to offend , upset , arouse and entertain its audience with what can best be described as a " mutated variety show " Christmas carol to the capitalistically overbearing , greed inspired , spiritually bankrupt , holiday season that makes most of us want to put the Suicide Hotline on speed dial . These people ( called non-secretors ) appear to have the O phenotype if you test their saliva instead of their blood , and comprise about 20 % of the population of Europe ( as well as people of European ancestry ) . I get my cash , and drive back to the liquor store . The point is that there are those who believe that our perception creates what we think of as reality , just as our brain alters and manipulates the image projected onto our retina to help make sense of what we " see .