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PubMed2006

Twinning and heteropaternity in chimpanzees (Pan troglodytes).

Unlike monozygotic (MZ) twins, dizygotic (DZ) twins develop from separate ova. The resulting twins can have different sires if the fertilizing sperm comes from different males. Routine paternity testing of a pair of same-sexed chimpanzee twins born to a female housed with two males indicated that the twins were sired by two different males. DNA typing of 22 short-tandem repeat (STR) loci demonstrated that these twins were not MZ twins but heteropaternal DZ twins. Reproductive data from 1926-2002 at five domestic chimpanzee colonies, including 52 twins and two triplets in 1,865 maternities, were used to estimate total twinning rates and the MZ and DZ components. The average chimpanzee MZ twinning rate (0.43%) equaled the average human MZ rate (0.48%). However, the chimpanzee DZ twinning rate (2.36%) was over twice the human average, and higher than all but the fertility-enhanced human populations of Nigeria. Similarly high twinning rates among African chimpanzees indicated that these estimates were not artifacts of captivity. Log-linear analyses of maternal and paternal effects on recurrent twinning indicated that females who twinned previously had recurrence risks five times greater than average, while evidence for a paternal twinning effect was weak. Chimpanzee twinning rates appear to be elevated relative to corresponding estimated human rates, making twinning and possibly heteropaternity more important features of chimpanzee reproductive biology than previously recognized.

Animals↗
PubMed2006

p,p'-DDE fails to reduce the competitive reproductive fitness in Nigerian male guppies.

The ecologically highly important effect of intermale competition is assessed here in a new approach to evaluating endocrine disruption at the population level. A guppy (Poecilia reticulata) male exposed to the antiandrogenic DDT metabolite p,p'-DDE competed against an unexposed male for the opportunity to fertilize a female. Offspring were then assigned to sires using microsatellites in genetic paternity analysis. In addition, a suite of male sexual characteristics including sperm count, coloration, and sexual behavior were also measured. p,p'-DDE produced no significant harmful effect on either the male sexual characteristics or the success in siring young, although the highest sublethal dose tested was only a factor 10 below the dose producing 100% mortality. At present, data on the antiandrogenic potency of p,p'-DDE are highly ambiguous. This study supports the increasing amount of evidence that the demasculinizing action of this chemical is often weak and highly variable across populations, even within the same species.

Animals↗
PubMed2002

A sex police for adults with "mental retardation"? Comment on Spiecker and Steutel.

This article is a rebuttal of the claim by Spiecker and Steutel that sex between people with mild and moderate "mental retardation" is morally permissable only with the substitutive consent of caregivers. After a review of historical, empirical and practical considerations, an ethical analysis is undertaken which concludes that Spiecker and Steutel's arguments are deeply flawed and their proposed policy morally objectionable.

Adult↗
PubMed2002

Reasonable paternalism and the limits of sexual freedom: a response to Greenspan and Leicester and Cooke.

This response argues that Greenspan's comment is basically incoherent, and that the position taken by Leicester and Cooke has unacceptable practical consequences. Greenspan admits that many people with 'mental retardation' lack adult decision-making capacities, but at the same time assumes that they have these very capacities in assigning them freedom rights. Leicester and Cooke consistently argue that people with 'mental retardation' do have adult reasoning powers and therefore should be given freedom rights. But this point has the rather disquieting implication that both the practice of treating 'mental retardation' as an exempting condition and the practice of giving them important special welfare rights seem to loose their justification.

Adult↗
PubMed2004

Inattentiveness, parental smoking and adolescent smoking initiation.

AIMS: To examine how adolescents' inattentive behaviour, together with parental smoking patterns, predicts smoking initiation by age 14. DESIGN, SETTINGS: A prospective, longitudinal study: baseline at ages 11-12, follow-up at age 14. A population-based sample of Finnish twins, born 1983-1987, with parents and classroom teachers as additional informants. Two groups were formed, allocating the co-twins of each family into separate groups: the study sample and a replication sample. PARTICIPANTS: Twin individuals (n = 4552), aged 11-12 at baseline and 14 (average 14.04 years) at follow-up. MEASUREMENTS: At baseline, inattentiveness was assessed with the Multidimensional Peer Nomination Inventory (MPNI, Teacher Form) and parental smoking with individual questionnaires completed by each twins' parents; at the age 14 follow-up, adolescent smoking was assessed with a self-report questionnaire. FINDINGS: At age 14, 57% reported never having smoked, 34% had experimented with cigarettes and 9% were current smokers. Inattentiveness and parental smoking additively predicted both experimental and current smoking in adolescence. The effects were independent of each other. CONCLUSIONS: The risk related to inattentiveness itself is high, but in combination with the effects of parental smoking, the probability of current smoking can rise as high as 38%, compared with 5% without these two risk factors. For prevention purposes, parental commitment to non-smoking should be emphasized.

Adolescent↗
PubMed2002

The cultural specifity of research ethics--or why ethical debate in France is different.

In the search for a globally binding ethical minimal consensus in dealing with research on human beings the awareness of the cultural specificity of such questions will be of central importance. France provides a good example of such cultural specificities. Three basic structures of French discussion on research ethics can be enumerated: first the particular weight placed on therapeutic benefit, second a particular accentuation on freedom and voluntarism, and third its lesser attention to the aspect of ability to give consent. The weak emphasis on the ability to give consent is rooted as much in the traditionally paternalistically imbued physician-patient relationship as in the French legal system, in which the doctrine of consent is not given the fundamental position of importance found in the Anglo-Saxon countries. As an important Roman country, a different accentuation in the ethical discussion on research on humans can be recognised, a discussion in which for a long time the right of self determination was less of a criterion for decision than the teleology of medical action. It is precisely this aspect of latent cultural influence in ethical convictions which is of decisive importance for future discussion on research on humans.

Cultural Diversity↗
PubMed1987

Suicide and civil commitment.

The contemporary approach to suicide prevention relies primarily on involuntary commitment of the suicidal individual. While there is generally widespread acceptance of the principle of society's right, even its moral obligation, to intervene to prevent a suicide, there is much less agreement concerning the conditions under which such an action should proceed. Most of the debate centers on the widely applied commitment criteria of mental illness and dangerousness to self and others. Questions have also been raised regarding the efficacy of commitment as a preventive measure. In this paper, these controversies are placed in a broader historical context. We examine empirical evidence concerning prevailing commitment criteria and the prophylactic value of involuntary hospitalization, and discuss the appropriateness of our current approach to civil commitment in light of existing data.

Commitment of Persons with Psychiatric Disorders↗