Although molecular systematists may use the terminology of cladism, claiming that the reconstruction of phylogenetic relationships is based on shared derived states , the latter is not the case. Rather, molecular systematics is based on the assumption, first clearly articulated by Zuckerkandl and Pauling , that degree of overall similarity reflects degree of relatedness. This assumption derives from interpreting molecular similarity between taxa in the context of a Darwinian model of continual and gradual change. Review of the history of molecular (...) systematics and its claims in the context of molecular biology reveals that there is no basis for the “molecular assumption.”. (shrink)

Although the construction of neo-Darwinism grew out of Thomas Hunt Morgan's melding of Darwinism and Mendelism, his evidence did not soley support a model of gradual change. To the contrary, he was confronted with observations that could have led him to a more "evo-devo" understanding of the emergence of novel features. Indeed, since Morgan was an embryologist before he became a fruit-fly geneticist, one would have predicted that the combination of these two lines of research would have resulted in early (...) formulations of concepts relevant to evolutionary developmental biology. It is thus of interest to review Morgan's thought processes and arguments for at first rejecting both Darwinism and Mendelism, and then for later dismissing data that would have yielded a model of rapid morphological change in favor of a model of change based on the accumulation of minor mutations and their morphological consequences. (shrink)

I attempt to raise questions regarding elements of systematics—primarily in the realm of phylogenetic reconstruction—in order to provoke discussion on the current state of affairs in this discipline, and also evolutionary biology in general: e.g., conceptions of homology and homoplasy, hypothesis testing, the nature of and objections to Hennigian “phylogenetic systematics”, and the schism between Darwinian descendants of the “modern evolutionary synthesis” and their supposed antagonists, cladists and punctuationalists.

We propose that the sudden emergence of metazoans during the Cambrian was due to the appearance of a complex genome architecture that was capable of computing. In turn, this made defining recursive functions possible. The underlying molecular changes that occurred in tandem were driven by the increased probability of maintaining duplicated DNA fragments in the metazoan genome. In our model, an increase in telomeric units, in conjunction with a telomerase-negative state and consequent telomere shortening, generated a reference point equivalent to (...) a non-reversible counting mechanism. (shrink)

In Abortion and the Ways We Value Human Life, Jeffrey Reiman argues that an overlooked clue to the solution of the moral problem of abortion lies in the unusual way in which we value the lives of individual human beings_namely, that we value them irreplaceably. We think it is not only wrong to kill an innocent child or adult, but that it would not be made right by replacing the dead one with another living one, or even several. Reiman (...) argues that there are only a limited number of facts that could justify such valuing, with the result that human children and adults have the fullest right to protection of their lives, infants have a lesser but substantial right to such protection, and fetuses do not qualify at all. Leading up to this argument, Reiman presents a survey of Western attitudes and laws about abortion from Hammurabi's Code to Roe v. Wade, and a critical analysis of all the major philosophical arguments on the issue, pro and con. The book is written in straightforward, jargon-free language that makes it accessible to college students at all levels and to the educated lay reader as well. (shrink)

Today's unprecedented levels of human migration present urgent challenges to traditional conceptualizations of national identity, nation-state sovereignty, and democratic citizenship. Foreigners are commonly viewed as outsiders whose inclusion within or exclusion from “the people” of the democratic state rests upon whether they benefit or threaten the unity of the nation. Against this instrumentalization of the foreigner, this book traces the historical development of the concepts of sovereignty and foreignness through the thought of philosophers such as Plato, Locke, Hobbes, Rousseau, Derrida, (...) and Benhabib in order to show that foreignness is a structural feature of sovereignty that cannot be purged or assimilated. Understood in this light, foreignness allows for new forms of democratic political unity to be imagined that reject local practices which deprive individuals of political membership solely on the basis of national citizenship. This cosmopolitan model for citizenship provides a novel conceptual framework that simultaneously upholds the legal importance of democratic citizenship for political justice while ceaselessly contesting the exclusionary logic of the nation-state that reserves democratic rights for members of the nation alone. (shrink)

Under the general tutelage of Kant, Charles Sanders Peirce (1839–1914) introduced American pragmatism to yet another philosophical dialectic: between a neglected transcendental instinct and earthly authorities. The dialectic became Peirce’s response to various evolutionary schemes in the 19th century. Guided by the recollected voices of Socrates, Jesus, St. John, Anselm, and Kant, as well as his own brand of pragmatism, Peirce eventually developed a “Neglected Argument for the Reality of God” a century ago, in 1908. Here, Peirce endorsed a more (...) adventurous god than ecclesiastical or theological authorities could imagine, a god of love (agapism) and chance (tychism), but still rife with fallibility. (shrink)

Given the increasing need for solid organ and tissue transplants and the decreasing supply of suitable allographic organs and tissue to meet this need, it is understandable that the hope for successful xenotransplantation has resurfaced in recent years. The biomedical obstacles to xenotransplantation encountered in previous attempts could be mitigated or overcome by developments in immunosuppression and especially by genetic manipulation of organ source animals. In this essay we consider the history of xenotransplantation, discuss the biomedical obstacles to success, explore (...) recent developments in transgenic sourcing of organs and tissues, and analyze the problem of infectious disease resulting from xenotransplantation (xenosis). We then apply a model of risk analysis to these risks. The conclusions of this risk analysis are used in an ethical evaluation of informed consent in xenotransplantation, with an ethical foundation in Kantian autonomy and Levinasian heteronomic alterity. Our conclusion is that individual and collective informed consent to the infectious disease risks of xenotransplantation requires an open, participatory and dialogical public policy process not yet seen in the United States and Europe. Until that process is created, we propose caution in xenotransplantation in general and a postponement of solid organ xenotransplants in particular. (shrink)

(1996). Capital punishment in the new Europe. The European Legacy: Vol. 1, Fourth International Conference of the International Society for the study of European Ideas, pp. 812-819.

WHAT COULD BE WRONG WITH SEEKING TO RESHAPE OURSELVES IN WAYS that we genuinely value? Jewish textual and cultural perspectives may add clarity and substance to the wider secular discussion of using genetic technologies for human enhancement. Judaism does not share the naturalism of Anglo-American bioethics; instead, it emphasizes covenantal responsibility for co-creation and stewardship of the body. Judaism tends to be more permissive about social uses of technology but more restrictive about personal aspirations and behavior. Enhancement technologies threaten the (...) moral universals of humility, personal responsibility, and social solidarity, which are embodied in Jewish tradition as duties to God, self, and others. The tradition demands that we seek self-perfection while humbly and cautiously acknowledging that we can never arrive at it nor even know exactly what we seek. (shrink)