Derek Roberts

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This article develops and tests a reformation of Baumrind's typology of authoritarian, permissive, and authoritative parenting styles in the context of adolescent school performance. Using a large and diverse sample of San Francisco Bay Area high school students (N = 7,836), we found that both authoritarian and permissive parenting styles were negatively(More)
The frequencies of HLA class I (HLA-A, B, C) and class II (HLA-DR, DQ) antigens were measured in 107 unrelated schizophrenic subjects and the results compared with 264 controls from south-east Scotland and a second control group of 133 individuals from north-east England. The expression of HLA-B35 was significantly reduced in the schizophrenic population(More)
Genealogical histories show that the inhabitants of Tristan da Cunha are derived from a known number of founders. Using the transmission of mitochondrial DNA (mtDNA) from mother to offspring pairs, we traced the mtDNA types found in 161 extant individuals to five female founders. Although the historical data claimed that two pairs of sisters were among the(More)
  • D F Roberts
  • Anthropologischer Anzeiger; Bericht über die…
  • 1987
The concepts of genetic constitution and genetic structure are defined in terms of arrays of gene frequencies, the array and distribution of genotypes, and the distribution of probable ancestral contributions to the gene pool. These concepts can, however, be differentiated. Examples of their application to human populations, to illustrate their descriptive,(More)
The first two families to be identified in the United Kingdom with the Li-Fraumeni syndrome of familial cancer are reported. The first family comprises breast carcinoma in the mother and adrenocortical carcinoma, medulloblastoma, and rhabdomyosarcoma in three of her four children, and the second family comprises breast carcinoma in the mother and(More)
The contribution of genes within the major histocompatibility complex to rheumatoid arthritis has been calculated (Rotter & Landaw 1984). Separate data from hospital- and population-based studies of monozygotic twin concordance rates and sibling recurrence risks have been used, along with material from published haplotype-sharing studies. Using either(More)