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

Properties and functions of synapses, Properties and Functions of Synapses ...

Properties and Functions of Synapses There is an interval between depolarisation of the presynaptic terminal and the earliest appearance of a postsynaptic response. This inter

Culture conditions, Culture Conditions The culture vessels placed in s...

Culture Conditions The culture vessels placed in suitable trays or racks, are stored on the shelves in a hygienically maintained culture room, under controlled conditions of l

Eretmochelys imbricata, Ivory was much in demand for production of a variet...

Ivory was much in demand for production of a variety of jewellery and artifacts in the past. Reptile leather from crocodiles, lizards and snakes has quite a high demand for manufac

Processed chicken products, P r o c esse d Chicken Products Prepar...

P r o c esse d Chicken Products Preparation of comminuted meat products is the best way to salvage meat from spent hens and broiler parent stock. Incorporation of whole eg

Non insulin dependent diabetes mellitus, Q. Explain about Non Insulin Depen...

Q. Explain about Non Insulin Dependent Diabetes Mellitus? Overweight and obese adults are generally afflicted by this type of diabetes. The insulin produced by the pancreas is

Plane of cleavage, PLANE OF CLEAVAGE - Each cleavage of the division...

PLANE OF CLEAVAGE - Each cleavage of the division zygote is marked by a cleavage furrow. Usually the first cleavage furrow is vertical & passes through the main axis of t

Porifera, general cherecter and anatomical stucture

general cherecter and anatomical stucture

Define the methods of concentration, Define the Methods of Concentration? ...

Define the Methods of Concentration? We define the concentration process as one that starts with a liquid product and ends up with a more concentrated, although still liquid a

Differentiate between glycogenesis and glycogenolysis, Differentiate betwee...

Differentiate between glycogenesis and glycogenolysis. The synthesis  of glycogen in liver and muscle  is  called glycogenesis.  The breakdown of glycogen in the liver (glycoge

What causes the signs, In the case story, Reggie presented with three typic...

In the case story, Reggie presented with three typical signs of hip fracture-shortening, adduction, and the lateral rotation of the affected limb. What causes these signs? (HINT-th

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