Very precise data on the dynamics of a competitive system of two species of Drosophila
have been obtained. By a curvilinear regression approach, analytical models of competition …

It has been proposed that modern humans descended from a single woman, the" mitochondrial
Eve" who lived in Africa 100,000 to 200,000 years ago. The human immune system …

The relative merits of molecular and paleontological dates of major branching points in the
tree of life are currently debated. In some cases, molecular date estimates are up to twice as …

The question whether ethical behavior is biologically determined may refer either to thecapacity
for ethics (ei, the proclivity to judge human actions as either right or wrong), or to the …

We describe allelic variation at 28 gene loci in natural populations of D. willistoni. Seventy
samples were studied from localities extending from Mexico and Florida, through Central …

We propose a general theory of clonal reproduction for parasitic protozoa, which has important
medical and biological consequences. Many parasitic protozoa have been assumed to …

▪ Abstract Pseudogenes have been defined as nonfunctional sequences of genomic DNA
originally derived from functional genes. It is therefore assumed that all pseudogene mutations …

The ultimate source of explanation in biology is the principle of natural selection. Natural
selection means differential reproduction of genes and gene combinations. It is a mechanistic …

Leishmaniasis is a geographically widespread severe disease, with an increasing
incidence of two million cases per year and 350 million people from 88 countries at risk. The …

The time of origin of the animal phyla is controversial. Abundant fossils from the major animal
phyla are found in the Cambrian, starting 544 million years ago. Many paleontologists hold …