Mutation and selection explain why many eukaryotic centromeric DNA sequences are often A + T rich.

We have used chromosome engineering to replace native centromeric DNA with different test sequences at native centromeres in two different strains of the fission yeast Schizosaccharomyces pombe and have discovered that A + T rich DNA, whether synthetic or of bacterial origin, will function as a centromere in this species. Using genome size as a surrogate for the inverse of effective population size (Ne) we also show that the relative A + T content of centromeric DNA scales with Ne across 43 animal, fungal and yeast (Opisthokonta) species. This suggests that in most of these species the A + T content of the centromeric DNA is determined by a balance between selection and mutation.

The Citizen Psychologist Curriculum-Preparing psychologists for public service: The 2018 American Psychological Association Presidential Initiative.

This article describes a curriculum developed as part of the American Psychological Association President Jessica Henderson Daniel's, 2018 Presidential Initiative-The Citizen Psychologist. The curriculum is designed to prepare the next generation of Citizen Psychologists to provide the broadest sense of service as leaders in their communities and in public service psychology. The curriculum prepares the learner to bring psychological knowledge, science, and expertise to bear on existing challenges to improve community well-being locally, nationally, and globally.

Development and validation of the Internalized Racial Oppression Scale for Black individuals.

This article describes the development and validation of the Internalized Racial Oppression Scale (IROS) for Black individuals in 2 studies using a total sample of 468 Black college students. The IROS is intended to measure the degree to which racial oppression is internalized and replicated by Black individuals in the United States. An exploratory factor analysis suggested a five-factor solution: Belief in the Biased Representation of History (BRH), Devaluation of the African Worldview and Motifs (DAW), Alteration of Physical Appearance (APA), Internalization of Negative Stereotypes (INS), and Hair Change (HC).