A great deal of information is known regarding the process of sex differentiation in fish, and
the mechanisms involved in primary sex determination are now beginning to be defined. A …

Although hybridization and introgression have been considered important in generation of
plant diversity, their role in evolutionary diversification of animals remains unclear. In this …

Evolutionary explanations of ageing fall into two classes. Organisms might have evolved the
optimal life history, in which survival and fertility late in life are sacrificed for the sake of early …

I n the past 25 years, theories to explain the prevalence of sexual reproduction have
proliferated; according to one classification, 20 hypotheses have been put forward' …

As mitochondria are inherited in a matrilinear way, an animal hybrid contains the
mitochondrial DNA of its 'mother species'. Of 80 studies that analysed the mitochondrial DNA …

A unisexual species is generally associated with polyploidy, and reproduced by a unisexual
reproduction mode, such as gynogenesis, hybridogenesis or parthenogenesis. Compared …

Exchange of homologous sequences between mitochondrial DNA (mtDNA) molecules is
thought to be absent in animals, primarily because of a failure to observe clear cases of …

The extreme rarity of asexual vertebrates in nature is generally explained by genomic decay
due to absence of meiotic recombination, thus leading to extinction of such lineages. We …

We have carried out an investigation of the effects of various parameters on the
accumulation of deleterious mutant alleles in finite diploid populations. Two different …

Female gynogens reproduce clonally but rely on sperm from heterospecific males to initiate
embryogenesis. It has been assumed that males gain no benefit from such matings; thus …