El índice de masculinidad, también llamado razón de sexo es un índice demográfico que expresa la razón de hombres frente a mujeres en un determinado territorio, expresada en tanto por ciento. Se calcula usando la fórmula: Las fuentes de los datos que permiten calcular el índice de masculinidad son los "censos de población".

Leer el artículo completo en Wikipedia · CC-BY-SA

The sex ratio is the ratio of males to females in a population. In most sexually reproducing species, the ratio tends to be close to 1:1. This tendency is explained by Fisher's principle. For various reasons, however, many species deviate from anything like an even sex ratio, either periodically or permanently. Examples include parthenogenic species, periodically mating organisms such as aphids, some eusocial wasps such as Polistes fuscatus and Polistes exclamans, bees, ants, and termites. The human sex ratio is of particular interest to anthropologists and demographers. In human societies, however, sex ratios at birth may be considerably skewed by factors such as the age of mother at birth, and by sex-selective abortion and infanticide. Exposure to pesticides and other environmental contaminants may be a significant contributing factor as well. As of 2014, the global sex ratio at birth is estimated at 107 boys to 100 girls (1000 boys per 934 girls).

Leer el artículo completo en Wikipedia · CC-BY-SA