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spec: Looking at other primate species ( apes , old world monkeys , and new world monkeys ) , we can see appreciable frequencies of A , B and O alleles as well ( although there are some primate species that have only A or B phenotypes ) . They gradually abandoned the hunter-gatherer way of life , began to live in permanent settlements , and began to practice agriculture . So far , BeatThePress does not seem to have much of an ideological bent , or at least not one that is clearly from the right or the left . Some archaeologists think that , rather than people deliberately domesticating animals , there was a gradual process whereby some animal species became used to living near human settlements , and a relationship built up that way . We will take you to the place , and we can go right now . With the exception of B alleles in humans and gorillas , the ABO alleles in other primate species differ greatly from human ABO alleles . For more information , see the Firewall Implementors VPN page at http://www.firewall.lanl.gov/howto/vpn.html . " Morooney , who holds a bachelor 's degree in engineering science and mechanics from Virginia Tech , is the author of more than two dozen professional presentations and published works . @ Tuition for freshmen at University Park in 2003-04 and freshmen and sophomores in 2004-05 was increased by $ 250 per semester ; at the other undergraduate campuses , these increases were $ 50 per semester . Emphasis is also given to the importance of maintaining a reflective learning diary or journal during your work on each module . First , make 100 % sure the other person realizes they have violated your copyright . The ABO alleles in our species appear to be millions of years old . The title character becomes a writer , hoping to acquire the respectability sought by his society-girl sweetheart . Read the full journal description . Our web site needs to describe Penn State 's range of resources internally and externally ( multiple campuses , majors , student organizations , housing options , etc. ) in a way that shows that we are ONE University . Thank you very much , Mr. Chairman . 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 ?