The pig. Domesticated pigs are generally given the subspecies name domestica. The haploid chromosome number is 19, and about 350 genes have been mapped. Because of its anatomical and physiological similarities with humans and the ease with which it can be bred in large numbers, the domesticated pig is the most likely source of organs for replacement of those incapable of continued function in humans. Unfortunately, pig organs transplanted into humans are rapidly rejected by the recipient's immune system. The generation of genetically engineered pigs may eventually overcome this rejection problem. See Classification, Chordata, Mammalia, Artiodactyla; swine, transgenic animals, xenoplastic transplantation.
Subjects: Genetics and Genomics.