In this article we apply a novel analytical framework to explore students' difficulties in understanding molecular genetics--a domain that is particularly challenging to learn. Our analytical framework posits that reasoning in molecular genetics entails mapping across ontologically distinct levels--an information level containing the genetic…

Background: Attention-deficit/hyperactivity disorder (ADHD) is strongly influenced by heritability. Identifying heritable vulnerability traits (endophenotypes) that mark a relatively high risk of developing the disorder can contribute to the identification of risk genes. A fruitful area for the search for such endophenotypes may be motor control…

At Oklahoma City Community College, they have developed gel electrophoresis activities that support active learning of many scientific concepts, including: pH, electrolysis, oxidation reduction, electrical currents, potentials, conductivity, molarity, gel electrophoresis, DNA and protein separation, and DNA fingerprinting. This article presents…

A behavioral genetic analysis of general writing ability was conducted using teacher assessments based on UK National Curriculum criteria for a sample of 3296 same-sex pairs of 7-year-old twins. Writing was highly heritable within the normal range (0.66) and at the low extreme (0.70). Environmental influences were almost all non-shared, with…

Background: This study is part of a larger UK-wide study investigating psychiatric illness in people with Prader-Willi syndrome (PWS), and describes the longitudinal aspect of psychiatric illness, in particular psychotic illness, and examines the use and role of psychotropic medication. Method: A total of 119 individuals with genetically confirmed…

Background: Twin studies of childhood behavior problems support the conclusion that individual differences in impulsivity, hyperactivity, and inattention are largely due to genetic influences. Non-genetic variation is due to environmental influences that are unique to the individual, and possibly to rater contrast effects. In the present…

Smith-Magenis syndrome (SMS) is a neurobehavioral disorder associated with deletions and mutations of the "RAI1" gene on chromosome 17p11.2. Clinical features of the syndrome include intellectual disability, sleep disturbance, craniofacial differences, and a distinctive profile of stereotypic and self-injurious behaviors. Although the functional…

The purpose of this study was to investigate how concept cartoons, together with other diagnostic and scaffolding tools, could be used in formative assessment, to stimulate talk and argumentation among students in small groups, as part of peer-assessment and self-assessment; and to provide diagnostic feedback about students' misconceptions to the…

Objective: Identification of differences among children with ADHD only, autism spectrum disorder (ASD)+ADHD, and chronic multiple tic disorder (CMTD)+ADHD may lead to better understanding of clinical phenotypes. Method: Children were evaluated using the parent- and teacher-completed questionnaires. Results: All three groups were highly similar in…

This study was aimed at finding out if the level of performance of selected Jamaican Grade 12 students on an achievement test on the concept of genetics was satisfactory; if there were statistically significant differences in their performance on the concept linked to their gender, self-esteem, cognitive abilities in biology, school-type and…

We used adopted and biological children from Waves 1 and 2 of the National Survey of Families and Households to study the links between parents' marital conflict, divorce and children's behavior problems. The standard family environment model assumes that marital conflict and divorce increase the risk of children's behavior problems. The passive…

Data from Terman's "Genetic Studies of Genius" (1925-1959) relating to sample size, mean IQ, and variance of IQ scores were analyzed in terms of their conformation to the theoretically projected statistics derived from a consideration of the normal curve. (Author/RC)

The author, a psychologist, concerned himself with the question of whether mental growth and decay are fixed in each of us by heredity, that is by our genes, or how far they are influenced by upbringing, education, and other factors in our environment. (Author/RK)

The basic differences between the sexes are, after all, genetic rather than social or cultural. Article investigated the implications of this fact for teachers and learners. (Editor/RK)

Ethical issues which surround the reproductive technologies being used to assist infertile couples include social impact, surrogacy, access to service and confidentiality. The use of reproductive technologies does not appear to cause harm, and often does a lot of good for the family and society. Surrogacy could be a valuable tool for the infertile…