Female biased sex ratios reduce competition between brothers when mating takes place within local patches. Male dispersal prior to mating is another strategy that reduces competition between brothers. One may thus expect these two traits to co-evolve and this is partially met in that sex ratios becomes less female biased as dispersal increases. However, the evolutionary stable degree of dispers...

OBJECTIVES This report presents total sex ratios at birth from 1940 to 2002, for race starting in 1970, for Hispanic origin groups starting in 1989, for live birth order starting in 1943, and for age of mother for the full time period. METHODS Descriptive tabulations of sex ratios using the birth data set are presented and interpreted. Joinpoint regression analysis is used to detect changes i...

The sex ratio of the local population influences mating-related behaviours in many species. Recent experiments show that male-biased sex ratios increase the amount of financial resources men will invest in potential mates, suggesting that sex ratios influence allocation of mating effort in humans. To investigate this issue further, we tested for effects of cues to the sex ratio of the local pop...

Tujuan penelitian ini yaitu untuk menganalisis pengaruh dependency ratio dan sex terhadap pertumbuhan ekonomi di Kota Langsa, baik secara parsial maupun simultan. Dalam menggunakan data sekunder yang diperoleh dari Badan Pusat Statistik Langsa. Metode analisis dalam pengujian asumsi klasik, regrsi linier berganda, uji t, F koefisien determinasi. Hasil menyebutkan bahwa variabel memilki positif ...

BACKGROUND Daily smoking adolescents are a public health problem as they are more likely to become adult smokers and to develop smoking-related health problems later on in their lives. METHODS The study is part of the four-yearly, cross-national Health Behaviour in School-aged Children study, a school-based survey on a nationally representative sample using a standardised methodology. Data of...

In his recent investigation “Atomic bomb testing and its effects on global male to female ratios at birth” [1], Victor Grech reports a rising birth sex ratio in most regions in temporal association with atomic weapon testing. Therefore, Grech’s observation corroborates corresponding findings across Europe after the nuclear Windscale fire [2, 3], after the Chernobyl accident [4–6], and in Cuba [...

ZIMMER, E. A., AND K. J. NEWTON. 1982. A simple method for the isolation of high molecular weight DNA from individual maize seedlings and tissues, pp, 165-168. In W. F. Sheridan (ed.), Maize for Biological Research. Plant Molecular Biology Assoc., Charlottesville, VA. ZIMMER, E. A., E. R. lUPE,AND V. E. WALBOT. 1988. Ribosomal gene structure, variation and inheritance in maize and its ancestors...

In many district of Haryana, there are many evidences that point out female birth is as burden on family. In Haryana result shows rapidly lowest child sex ratio report by the 2001&2011 census. Haryana is amongst the most affected state regarding declining and imbalance of child sex ratio. Therefore, this state is the main focus area of this study. Though there are the many reasons behind declin...

Demographers are interested in sex preferences for children because they can skew sex ratios and influence population-level fertility, parenting behavior, and family outcomes. Based on parity progression ratios, in most European countries, there are no sex preferences for a first child, but a strong preference for mixed-sex children. We hypothesize that mixed-sex preferences also influence pare...