نتایج جستجو برای: cytotype
تعداد نتایج: 241 فیلتر نتایج به سال:
A reproductive advantage afforded to female hosts by obligate intracellular Wolbachia infections can result in the spread of the vertically-inherited bacteria into the host population, replacing the uninfected cytotype (population replacement). Here we examine Wolbachia infection dynamics relevant to the origin of Wolbachia superinfection (i.e., host individuals that are co-infected with two or...
BACKGROUND AND AIMS In a mixed-ploidy population, strong frequency-dependent mating will lead to the elimination of the less common cytotype, unless prezygotic barriers enhance assortative mating. However, such barriers favouring cytotype coexistence have only rarely been explored. Here, an assessment is made of the mechanisms involved in formation of mixed-ploidy populations and coexistence of...
Cytogenetic studies were conducted on three discus species which inhabit the Amazon in Brazil: Symphysodon haraldi from Manacapuru, S. aequifasciatus from Tefé and S. discus from Barcelos. All individuals showed 2n=60 chromosomes, most of them biarmed. No sexual chromosomal heteromorphism was verified. However, different karyotypic formulae, owing to the presence of subtelocentric chromosomes, ...
Introduction Conflict often leads to nonequilibrium fluctuations as attackers spread, host defences increase, and counter-attack evolves. Spatial processes play a crucial role when attack types arrive from other populations and import of matching defence follows. We focus on cytoplasmic male sterility (CMS), an ideal system in which to study the spatial dynamics of conflict. Cytoplasmically inh...
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