Total fertility rate, Biology

Assignment Help:

Total Fertility Rate

Total fertility rate (TFR) is the total number of children a women can be expected to bear in a given population if birth rates are constant for at least one generation. Replacement level is a value of TFR and is the number of children a couple must have to replace themselves. You might think that two parents would have to have only two children to replace themselves.

The actual average replacement level is, however, slightly higher, primarily because some children die before reaching their reproductive years. In developed countries the replacement level is fixed at 2.1. In developing countries where infant mortality rates are high and life expectancies are short, replacement level is about 2.7. If replacement level is low-below 2 i.e. each couple has children less than those required to replace themselves, then the population will actually decline as in the case of Sweden and Germany.


Related Discussions:- Total fertility rate

Conclusions from the monohybrid crosses, Conclusions drawn from the Monohyb...

Conclusions drawn from the Monohybrid Crosses From the results of his monohybrid crosses, following conclusions were obtained :- 1 .       Law of Unit or Paired Factors (Po

Evolution , What benefits led to natural selection of a two-circuit pump f...

What benefits led to natural selection of a two-circuit pump function of the heart a) One circuit to go from the heart to the body and one from the heart to the lungs b) One cir

Control and informative function of organic molecules, Q. What are the few ...

Q. What are the few examples of the control and informative function of organic molecules? Based on genetic information, organic molecules control the entire work of the cell.

Defects of nervous system, DEFECT S OF NERVOUS SYSTEM - 1.      Ataxi...

DEFECT S OF NERVOUS SYSTEM - 1.      Ataxia - Lack of muscle-cordination due to damage of cerebellum. 2.      Dyslexia - In ability of a person to comprehense written l

Illustarte the utilization of soy protein concentrate, Utilization of Soy P...

Utilization of Soy Protein Concentrate Soy protein concentrates are used in food products for  their nutritional characteristics or for their functional properties or for both.

Evaluate the texture of various foods, Q. Evaluate the texture of various f...

Q. Evaluate the texture of various foods? A number of instruments are available to evaluate the texture of various foods. Brief discussions on these instruments follow. Cons

Providing critical resources - conservation of wildlife, Providing Critical...

Providing Critical Resources - Conservation of Wildlife Another way to improve the habitat of a threatened species is to determine which resource is limiting the population si

Accuracy of stress echocardiography, Q. Define Accuracy of Stress Echocardi...

Q. Define Accuracy of Stress Echocardiography? The accuracy of stress echo tests for the detection of coronary artery disease is expressed as the sensitivity and specificity of

Effects on materials - air pollutants, Effects on Materials - Air pollutant...

Effects on Materials - Air pollutants Most air pollutants are reactive chemicals, so they react with most of the substances around. You may recall from your chemistry lessons

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd