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TSR Wiki > Study Help > Subjects and Revision > Revision Notes > Geography > Sex Structure
- The sex structure refers to the proportions of the 2 sexes in a defined population.
- It is expressed as the number of males to every 100 females.
- Male births usually exceed female births, but males die off more quickly in infancy, so by the time children are 1 yr old, there are more females than males.
- The sex structure may be affected by the following
- Where women are considered subordinate beings, they suffer a higher mortality rate and a lower life expectancy.
- Migration. There is usually a dominance of males in populations dominated by immigrants.
- In difficult environments, there is usually an imbalance in favor of males.
- Select populations such as military towns may have an imbalance for either of the sexes.
- Urban areas in developing regions have more males.
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