Types of evolution, PL-SQL Programming

TYPES OF EVOLUTION -

Sequential evolution                  :                    Minor changes in the gene pool of a population from one generation to the next, with the result that no new populations are formed, but the descendent population is not genetically identical with its predecessor.

Microevolution                            :           Evolution of subspecies or geographic races.

Macroevolution                           :           Evolution of species and genera.

Megaevolution (Simpson 1953)   :            Evolution of families, order, classes and phylum.

Quantum evolution                     :                    (a) Evolution of higher taxonomic group such as orders and classes (b) Evolutionary processes operating above species level i.e., combination of macro and mega evolutions.

Phyletic evolution                       :                    The directional changes in the average character of a population. This is caused either due to adaptation to a shifting environment or due to increasing specialization for a particualr environment or improved adaptation in a constant environment.

Convergent evolution                  :                    Acquiring similar sets of characteristics in response to the adaptation to a common or similar environment by the individuals of two or more totally unrelated or distantly related groups. As a result, the organism with completely different body organization come to possess superficial resemblance.

Divergent evolution/                    :           Development of different structures from a common ancestral form.

adaptive radiation                                            Examples of adaptive radiation occurred on the isolated continent of Australia, where the diversity of habitats and the absence of competitors sparked an adaptive radiation of marsupials (pouched mammals).

Progressive evolution                 :           Development of complex and specialized structure from simpler forms.

Retrogressive evolution              :           Development of simpler structure from complex forms.

Parallel evolution                       :                     Organisms of different classes can acquire similar characters independently and separately to avail the similar environment. Parallel evolution occurs when genetically related species adapt to similar environmental changes in similar ways.

Co-evolution                               :           In nature, species frequently interact so closely that evolutionary changes in one species may cause evolutionary adjustments in others. This evolutionary interaction between organisms is called co-evolution.

Posted Date: 10/8/2012 8:50:42 AM | Location : United States







Related Discussions:- Types of evolution, Assignment Help, Ask Question on Types of evolution, Get Answer, Expert's Help, Types of evolution Discussions

Write discussion on Types of evolution
Your posts are moderated
Related Questions
Functions The function is a subprogram which can take parameters and be invoked. Normally, you can use a function to calculate a value. The function has 2 sections: the specifi

Based on the EMPLOYEE table created in Assignment #1, write a PL/SQL anonymous block that accepts an employee ID from the user input and finds whether the employee ID is in the EMP

Using Cursor Attributes: Every cursor has 4 attributes: %NOTFOUND, %FOUND, %ISOPEN, and %ROWCOUNT. If appended to the cursor name, they return the helpful information about

Controlling Cursor Variables You use 3 statements to control the cursor variable: OPEN-FOR, FETCH, & CLOSE. At First, you OPEN a cursor variable FOR a multi-row query. Then, y

Parameter Modes   To define the behavior of formal parameters you use the parameter modes. The 3 parameter modes, IN, OUT, & IN OUT, can be used with any subprogram. Though, a

Overview of control structures According to the structure theorem, any computer program can be written by using the basic control structures as shown in figure below. They can b

Data Types in SQL - Integer INTEGER or  synonymously INT, for integers within a certain range. SQL additionally has types SMALLINT and BIGINT for certain ranges of integers. T

Tautologies: Above given table allows us to read the truth of the connectives in the next manner. Just expect we are looking at row three. It means this says that, if there P

%NOTFOUND The %NOTFOUND is logical, opposite of the %FOUND. The %NOTFOUND yields FALSE if the last fetch returned a row, or TRUE when the final fetch failed to return a row. I

Project Description: We organize an online system called ACPAS we have created a project called EVO that can be use by our customers to integrate their web sites with the Acpas