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

Control of glycogen metabolism, The major factor which controls glycogen me...

The major factor which controls glycogen metabolism in the liver is the concentration of phorphorylase alpha. Certainly, this enzyme catalyzes the limiting step of glycogen breakdo

Incompatibility - pollination and fertilization, Incompatibility - Pollinat...

Incompatibility - Pollination and Fertilization Plants growing under natural conditions have a preference for their mating partners. The stigma of the female parent receives a

Explain vaccine of typhoid, Typhoid  Typhoid vaccine is recommended for...

Typhoid  Typhoid vaccine is recommended for travellers to developing countries in Central and South America, Africa and Asia, especially if they plan a long stay or may be livi

Intraspecific and interspecific competition, In the preceding block you lea...

In the preceding block you learnt the Darwinian premise of natural selection based on certain facts and deductions thereof. You would have noticed that one of the foundations for t

Accident causation - accidents and losses, Accident Causation - Acciden...

Accident Causation - Accidents and Losses Several accidents occurs everyday year round in industries. We have already discussed different types of accidents and injuries t

Vitamin - k, VITAMIN - K Also known as naptho quionone / anti haemo...

VITAMIN - K Also known as naptho quionone / anti haemorrhagic vitamin / coagulation vitamin / menadone . It requires for formation of blood clotting factor prothrombin.

Which is used to refer iron-containing in muscle cells, In biological studi...

In biological studies which of the below is used to refer to iron-containing, oxygen-binding, conjugated protein complex present in sarcoplasm of muscle cells? a) Myelin b)

Define advantages of using bacteria as a source of protein, Define Advantag...

Define Advantages of using Bacteria as a source of protein? Advantages of using Bacteria as a source of protein are as follow: 1. High yield of protein (60-80%) 2.

Why is rubella during gestation a threat to the fetus, Q. Why is rubella du...

Q. Why is rubella during gestation a threat to the fetus? If taking place during gestation rubella is a dangerous disease because the virus crosses the contaminates fetus and t

Drug injection and hepatitis , Task: Write a maximum of five (5) pages of y...

Task: Write a maximum of five (5) pages of your research plan which should include details on the following topics as appropriate to your chosen study design: I. Background info

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