Parenting as Phenotype: A Behavioral Genetic Approach to Understanding Parenting

This article discusses the behavioral genetic (BG) approach to parenting. Parenting is considered a phenotype that can be influenced by nature and nurture. Genetic contributions to parenting are conceptualized as evidence of genotype–environment correlation (rGE). Early BG studies focused on demonstrating that some parenting dimensions were heritable due to passive and evocative rGE processes. Current studies are investigating moderators and mediators of genetic and environmental contributions to parenting. The paper uses parent and child report data on parental warmth from the Twins, Adoptees, Peers, and Siblings study to illustrate the BG approach. Results show that heritability is significant for parent and child reports, but environmental influences differ by information source. Three questions are addressed concerning the BG approach to parenting: What is the nature of parenting? How does the approach inform parenting practice and interventions? What are the future directions

Review Article: Recent Research On the Military in Society

The Social Psychology of Military Service; Sage Research Progress Series on War, Revolution, and Peacekeeping; Vol. VI, Young Men and Military Service; Vol. V, Youth in Transition, and The Soldier and Social Change; Comparative Studies in the History and Sociology of the Militar

Eye refraction in doubly exchanged monozygotic twins

This case study examined the hypothesis that longer outdoor time results in normal vision and refractive status, using unique genetically informative kinships. The participants were the members of 29-year-old doubly exchanged monozygotic male twin pairs from Bogotá, Colombia, in South America. Comprehensive ophthalmological examinations, including uncorrected and corrected visual acuity, refraction and keratometry, and visual life history interviews were undertaken; all examinations were conducted by two ophthalmologists blind to the hypothesis, relatedness, and rearing status of the four participants. Normal uncorrected vision and refractive status were present in the two rural-raised, unrelated brothers, relative to their urban-raised counterparts. Uncorrected visual acuities were 20/160 and 20/200 for the city-raised twins and 20/20 and 20/30 for the country-raised twins. Premature birth, low birth weight, computer use, and reading time could not explain these differences. It was concluded that time spent outdoors appears to be a significant factor in the development of myopia, reinforcing extant findings via a novel experimental approach

Maternal Employment and the Mother-Child Relationship

It has been suggested that a mother’s employment status affects her relationship with her children. This study examined whether children of stay-at-home mothers showed differences in the mother-child relationship than those of employed mothers. Participants were 252 sibling-pairs, 8-13 years, in the Twins, Adoptees, Peers and Siblings Study. Children completed measures on maternal warmth, trust, and conflict. Mothers reported their occupations. Independent t-tests were used to compare mean scores for maternal warmth, trust and conflict. There was no significant statistical difference between the groups, which suggests maternal employment does not affect relationship quality. Follow up analyses will examine biological sex

Parental differential treatment: A twin-sibling-adoptee study

From a behavioral genetic perspective, similar experiences between siblings will vary by genetic relatedness. The purpose of the present study was to examine parental differential treatment across twins, siblings, and adoptees using a genetic model. Mothers of 54 monozygotic (MZ) twins, 86 dizygotic (DZ) twins, 68 full siblings (FS), and 43 same-aged adoptees (VT) reported their differential treatment of both siblings in three dimensions: school, play, and discipline. The results supported our genetic hypothesis, with a significant effect for dyad type, F (9, 581) = 2.47, p\u3c0.01