Join our community

Learn Morecaret down

caret down

Join our community

Fiveable Community students are already meeting new friends, starting study groups, and sharing tons of opportunities for other high schoolers. Soon the Fiveable Community will be on a totally new platform where you can share, save, and organize your learning links and lead study groups among other students! ๐ŸŽ‰

group of students
group of students

ap hug study guides

๐Ÿ™ย  Free Reviews 2020

๐Ÿ‘จโ€๐ŸŒพย  Unit 5: Agriculture & Rural Land-Use

2.3 Population Composition

#populationpyramid

#sexratio

โฑ๏ธย ย 2 min read

written by

edmund scanlan

April 30, 2020


Sex Ratio

Sex ratio is the number of males per one hundred females in the population. That and age structure are analyzed and mapped in regions around the world. In the developed world there are more women than men.

This is because the life expectancy is longer for women than men in every country. This is because men tend to have jobs with higher mortality rates (construction, police, military). Men are at higher risks of heart disease.

Men also die in accidents more often.

In the developing world, there are more men because male babies are preferred. In India, it is illegal to find out the sex of the baby in utero, because of so many abortions of female fetuses. In China, there are now millions more men than women in their childbearing years, because during the one-child policy male babies were strongly preferred.

โž• China's woman shortage creates an international problem

โž• Indian police raid illegal ultrasound centers to save unborn girls

Age Structure

Patterns of people at various ages vary in different regions within countries. Cities with large universities have an inordinate number of people aged 15-24. Parts of Florida and Arizona with large retirement communities have a high percentage of people 60 and older.

In some countries you will find an extremely high number of men between their 20s and 50s, because of so many migrant workers coming in for employment opportunities.

Population Pyramids

The most important tool in measuring sex ratio and age structure is the population pyramid, which is a bar graph that represents the distribution of population by sex and age. Population pyramids use five year increments of age and separate males on the left and females on the right (women are always right!)

This can show you if there is a high or low dependency ratio, more females or males, or a high percentage of young or old.ย 

What can you learn from population pyramids?

  1. Size of dependent populations

  2. Birth rate / death rate

  3. Gender makeup

  4. Life expectancy

  5. Size of economically active populations

This is very handy when analyzing a countryโ€™s stage in the demographic transition model (DTM). It is the process of change in a societyโ€™s population from a condition of high crude birth and crude death rates, and low rates of natural increase, to a condition of low crude birth and crude death rates, low rate of natural increase, and higher total population.

https://i.ibb.co/6gtnssk/AP-Human-Geo-Population-Pyramids.jpg

https://i.ibb.co/DY6WyMd/AP-Human-Geo-Population-Pyramids-1.jpg

๐ŸŽฅ Watch: AP HUG - Population Pyramids

continue learning

Slide 1 of 13
Fiveable

Join Our Community

Fiveable Community students are already meeting new friends, starting study groups, and sharing tons of opportunities for other high schoolers. Soon the Fiveable Community will be on a totally new platform where you can share, save, and organize your learning links and lead study groups among other students!๐ŸŽ‰

Fiveable Logo

2550 north lake drive
suite 2
milwaukee, wi 53211

92% of Fiveable students earned a 3 or higher on their 2020 AP Exams.

*apยฎ and advanced placementยฎ are registered trademarks of the college board, which was not involved in the production of, and does not endorse, this product.

ยฉ fiveable 2020 | all rights reserved.