Results 121 to 130 of about 464 (138)
Some of the next articles are maybe not open access.
A cytological demonstration of arrhenotoky in three mites of the family Phytoseiidae
Chromosoma, 1964Chromosome numbers of Phytoseiulus persimilis. Amblyseius fallacis, and Typhlodromus caudiglans were determined in lacto-propionic orcein squashes of developing eggs. Eggs of all species had either four or eight chromosomes: this indicates arrhenotoky (2 n = 8). All chromosomes are acrocentric; one of P. persimilis and one of A.
Roger I C Hansell
exaly +3 more sources
Thelytokous worker reproduction and lack of Wolbachia infection in the harvesting ant Messor capitatus [PDF]
Ethology Ecology and Evolution, 2000 In hymenopteran societies, workers are not always sterile, and may produce parthenogenetically either males (arrhenotoky) or females (thelytoky). Thelytoky however is exceptional, and has been recorded in only four ant species.
Alessandra Mori +2 more
exaly +2 more sources
Sex Determination in the Hymenoptera
Annual Review of Entomology, 2008 The dominant and ancestral mode of sex determination in the Hymenoptera is arrhenotokous parthenogenesis, in which diploid females develop from fertilized eggs and haploid males develop from unfertilized eggs.
George E. Heimpel, Jetske G de Boer
exaly +2 more sources
Insectes Sociaux, 2015
In most honey bees, unfertilized eggs develop into haploid males via arrhenotokous parthenogenesis. The Cape honey bee (Apis mellifera capensis) is different. Although mated queens always produce females sexually, if workers lay unfertilized eggs the eggs develop into diploid females via thelytokous parthenogenesis. Thelytoky in A. m.
Benjamin P Oldroyd +2 more
exaly +2 more sources
In most honey bees, unfertilized eggs develop into haploid males via arrhenotokous parthenogenesis. The Cape honey bee (Apis mellifera capensis) is different. Although mated queens always produce females sexually, if workers lay unfertilized eggs the eggs develop into diploid females via thelytokous parthenogenesis. Thelytoky in A. m.
Benjamin P Oldroyd +2 more
exaly +2 more sources
The distribution of thelytoky, arrhenotoky and androgenesis among castes in the eusocial Hymenoptera
Insectes Sociaux, 2017Thelytokous parthenogenesis is the production of females from unfertilized eggs. In this review we categorize the known thelytokous eusocial Hymenopterans (mostly ants) by their modes of worker and queen reproduction. The resultant tabulation reveals that: (1) there are no species in which queens are thelytokous and workers are exclusively ...
Frances Goudie, Benjamin P. Oldroyd
openaire +1 more source
A Fundamental Theorem of Natural Selection for Sex Linkage or Arrhenotoky
The American Naturalist, 1972Equation (11) is a general equation for the change in geometric mean fitness at a male haploid or sex-linked locus when the selection intensity is small. The rate of change in fitness depends on the additive genetic variance in fitness, which is defined as the variance of the additive genotypic values when the additive model of gene action assumes no ...
openaire +1 more source
Chromosoma, 1972
Parthenogenesis is reported in three soft scales with 2n=16. In the unfertilized eggs of all three, oogenesis is normal and diploidy is restored by the fusion of the division products of the haploid female pronucleus. In Lecanium putmani Phillips 12 of 13 uninseminated females collected in the wild produced only males.
openaire +1 more source
Parthenogenesis is reported in three soft scales with 2n=16. In the unfertilized eggs of all three, oogenesis is normal and diploidy is restored by the fusion of the division products of the haploid female pronucleus. In Lecanium putmani Phillips 12 of 13 uninseminated females collected in the wild produced only males.
openaire +1 more source
Proceedings of the Royal Entomological Society of London. Series A, General Entomology, 1964
SYNOPSIS An account is given of the composition of populations in galleries formed by Xyleborus compactus in stems of coffee and cocoa in Western Nigeria. The incidence of arrhenotokous parthenogenesis and of a high degree of inbreeding is described and the possible significance of inbreeding in regard to variation in morphology and ...
openaire +1 more source
SYNOPSIS An account is given of the composition of populations in galleries formed by Xyleborus compactus in stems of coffee and cocoa in Western Nigeria. The incidence of arrhenotokous parthenogenesis and of a high degree of inbreeding is described and the possible significance of inbreeding in regard to variation in morphology and ...
openaire +1 more source