In the now broad field of human dental genetics, variations in the number of permanent teeth have attracted repeated attention. Indeed, of articles dealing with population frequencies, pedigree analysis, or estimates of hereditability, the greatest number have been concerned with missing or supernumerary teeth.'-4 It is not difficult to understand why such tooth number polymorphisms have preemp...

Premature adrenarche (PA) is defined as adrenarcheal levels of adrenal androgens before the age of 8 yrs in girls and the age of 9 yrs in boys leading to androgenic signs ranging from pubarche to oily skin and adult type body odor. PA has been connected with adverse metabolic features and increased risk for ovarian hyperandrogenism. The pathogenesis of PA is considered polygenic. However, under...

The level of DNA polymorphism in the ancestral species at the time of speciation can be estimated using DNA sequences from many loci sampled from 2 or more extant species. The comparison between ancestral and extant polymorphism can be informative about the population genetics of speciation. In this study, we collected and analyzed DNA sequences of approximately 60 genes from 4 species of Sonne...

OBJECTIVE — Among Europeans, mutations in the hepatocyte nuclear factor-1 (HNF1 ) gene are associated with the most common form of maturity-onset diabetes of the young (MODY)3. In Asian Indians, type 2 diabetes occurs earlier and often overlaps with MODY, but the genetics of the latter are unknown. The aim of this study was to estimate the prevalence of Ala98Val polymorphism of the HNF1 gene in...

Whether and how habitat fragmentation and population size jointly affect adaptive genetic variation and adaptive population differentiation are largely unexplored. Owing to pronounced genetic drift, small, fragmented populations are thought to exhibit reduced adaptive genetic variation relative to large populations. Yet fragmentation is known to increase variability within and among habitats as...