In order to evaluate the impact of assisted reproductive technology (ART) procedure and individual factors on the sex ratio of singletons and twins at birth afterin vitrofertilization (IVF) and intra-cytoplasmic sperm injection (ICSI) treatment in China. We conducted a retrospective cohort study in...
During a survey of the geographical distribution and abundance of hamadryas baboons (Papio hamadryas hamadryas) in central Eritrea, we collected detailed demographic data on six bands at four sites in different ecogeographical zones. The proportions of age-sex classes within the six bands differed ...
Sex ratio theory is concerned with the adaptive consequences of sex-biased parental allocation to offspring13,14, with the processes generating sex ratio bias after birth receiving less theoretical and empirical attention15. Here, we use a demographic pathway model to quantify ASR variation among avia...
Hypertrophied sexually dimorphic eye stalks have evolved independently in several families of Diptera, with the eyespan of males exceeding their total body length in some species. These structures function in intermale contests for territories and in mate attraction, the classical mechanisms of sexual ...
Although the ratio of males to females in a population is known to influence behavior in nonhuman animals, little is known about how sex ratio influences human behavior. We propose that sex ratio affects women's family planning and career choices. Using both historical data and experiments, we ...
In Krina jama there is a clearly visible dominance of male individuals. The possibility of sex-related clustering is depending on the sex-dimorphism-index (sdi). Possible correlations between sex-dimorphism, sex ratio, altitude of the site and taxonomic attribution are discussed by means of ...
A molecular sexing method by polymerase chain reaction (PCR) amplification of a portion of the sex-determining region Y (SRY) and the zinc finger (ZF) gene, as well as six equine Y-chromosome-specific microsatellite markers, were tested in the Malayan ta
Secondary sex ratios of animals with genetically determined sex may considerably deviate from equality. These deviations may be attributed to several proxi
Genetic manipulation of sex ratio for the large-scale production of all- male tilapia Oreochromis niloticus L. We describe the results of a breeding programme for Nile tilapia, Oreochromis niloticus, incorporating estrogen-induced sex reversal of male to female and ... GC Mair,JS Abucay,TA Abella...
Though Chinas 1982 census provides an accurate picture of overall and age-sex-specific population data it does not include data for its 4238 million servicemen. Liu Zheng presents the age-sex-specific data of these servicemen published in 1982 by the Population Census Office under the State Counci...