sex ratios
Queen controlled sex ratios and worker reproduction in the bumble bee Bombus hypnorum, as revealed by microsatellites
... Population sex ratios consistent with queen control per se are not uncommon in bumble bees (six of 11 cases reviewed by Bourke (1997), despite their more publicised highly male-biased sex ...
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Changing trend? Sex ratios of children born to Indian immigrants in Norway revisited
... order sex ratios for families where all the previously born children are female, to see if the trend had changed for them as ...where sex selective abortion would be most expected, the last period ...
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Haldane’s Rule Is Linked to Extraordinary Sex Ratios and Sperm Length in Stalk-Eyed Flies
... of sex chromosome meiotic drive sys- tems (Frank 1991; Hurst and Pomiankowski ...1991). Sex chromosome meiotic drive refers to non-Mendelian passage of the X (or Y) chromosome into gametes and causes biased ...
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Haplodiploidy and the evolution of eusociality : split sex ratios
... their sex allocation but not in any other ...split sex ratios can facilitate the evo- lution of eusociality but also to parameterize the models with empirical data and hence quantify their possible ...
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Different sex ratios of children born to Indian and Pakistani immigrants in Norway
... specific sex, and prenatal selection of male embryos has become more common ...[22]. Sex-selective abortion to secure a male offspring conflicts with Norwegian ethics and social norms, and the negative ...
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Seasonal Variation in Sex Ratios Provides Developmental Advantages in White-tailed Deer, Odocoileus virginianus
... offspring sex ratio we analyzed data similar to Smallwood and Smallwood ...whether sex ratios differed among these groups using repeated measures analysis of variance repeated among years with a ...
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Socio economic determinants of child and juvenile sex ratios in India : A longitudinal analysis
... 0-6 sex ratio is lower in these regions compared to the control ...highest sex ratios of the population aged 0-6 years in the country, higher than those in Uttar Pradesh and Madhya Pradesh, though ...
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Mutually beneficial host exploitation and ultra biased sex ratios in quasisocial parasitoids
... harmandi sex ratios were very strongly female biased, as reported in other studies of this species and its conge- ners 13,15,16,18,28,32,44,45 ...Female-biased sex ratios are often explained ...
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Haploid Selection Favors Suppressed Recombination Between Sex Chromosomes Despite Causing Biased Sex Ratios
... by sex differences in sur- vival, biased sex ratios at flowering are common among dioecious plants with 76/243 species exhibiting signifi- cantly male-biased sex ratios and 45/243 ...
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Constraints on maternal ability to adjust sex ratios in mammals
... The males that mated the most had lower sperm sex ratios, opposite to our initial predictions. Mated males appear to have fewer spermatozoa; however, we were unable to quantify this. Previous studies have ...
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Measurement and modelling of primary sex ratios for species with temperature dependent sex determination
... Because sex ratio is a key demographic parameter, populations of reptiles with TSD are hypothesized to be influenced by rapid climate change (Janzen, 1994); in fact, green sea turtles from the Great Barrier Reef ...
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A framework for analyzing sex-selective abortion: the example of changing sex ratios in Southern Caucasus
... the sex-ratio increased very quickly and similarly in the three countries indicates that they had all the conditions to accept this new behavior once the technology became ...in sex-ratios seems also ...
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Sex Ratios Provide Evidence for Monozygotic Twinning in the Ring-Tailed Lemur, Lemur catta
... Monozygotic (MZ) twinning is generally considered to be rare in species other than human. We inspected sex ratios in European zoo-bred ring-tailed lemurs (Lemur catta), revealing a significant excess of ...
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Plasmodium falciparum gametocyte sex ratios in children with acute, symptomatic, uncomplicated infections treated with amodiaquine
... biased sex ratio, and we have no explanation for our ...biased sex ratio following treatment with ...female-biased sex ratio [7], it would now be important to evaluate the predictors of male biased ...
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HUMAN TWINNING IN THE UNITED STATES: RACIAL FREQUENCIES, SEX RATIOS, AND GEOGRAPHICAL VARIATIONS
... The single births are listed for white, negro, Indian, Chinese, and Japanese separately, but the multiple births since 1922 have not been classified in this way but have [r] ...
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SECULAR TRENDS AND LATITUDE GRADIENTS IN SEX RATIOS AT BIRTH IN THE FORMER SOVIET REPUBLICS
... of sex-selective termina- tion, but data with regard to the availability of such services was not available for ...as sex-se- lective abortion may further influence M/F ...
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ARE DEVIANT SEX RATIOS IN NORMAL STRAINS OF DROSOPHILA CAUSED BY ABERRANT SEGREGATION?
... Other evidence on this point is as follows: It was thought that if in fact the sex ratio in the progeny of Oregon-R males was determined by the genotype of the male parent and [r] ...
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Divorce and infidelity are associated with skewed adult sex ratios in birds.
... Universities of Leeds, Sheffield and York http://eprints.whiterose.ac.uk/ White Rose Research Online URL for this paper: Current Biology http://eprints.whiterose.ac.uk/id/eprint/79125.. [r] ...
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DISTORTED SEX RATIOS DUE TO SEGREGATION DISTORTER IN DROSOPHILA MELANOGASTER
... ments with both lines: a treatment effect on k is accompanied in each case by an effect on the cn bw sex ratio, while the SD sex ratio is apparently not affected by treatment.-T[r] ...
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Where Have All The Young Men Gone? Evidences and Explanations of Changing Age: Sex Ratios in Kampala
... Thus in Kampala, along with population growth and a declining overall sex ratio, censuses show a growing excess of girls/young women over boys/young men. The article[r] ...
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