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
Methods: In normal, a method is a subprogram declared in an object type specification using the keyword MEMBER or STATIC. The method cannot have similar name as the object typ

Using Operator DEREF: You cannot navigate through refs within the PL/SQL procedural statements. Rather than, you should use the operator DEREF in the SQL statement. The DEREF

Declaring Objects: You can use the object types wherever built-in types like CHAR or NUMBER can be used. In the block below, you can declare object r of type Rational. Then, yo

How Transactions Guard Your Database The transaction is a sequence of SQL data manipulation statements which does a logical unit of work. The Oracle treats the sequence of SQL

LONG and LONG RAW You use the LONG datatype to store the variable-length character strings. The LONG datatype is such as the VARCHAR2 datatype, except that the maximum length o

Keyword & Parameter Description: PRAGMA: These keywords signify that the statement is a pragma (i.e. compiler directive). The Pragmas are processed at the compile time, n

Example of Cast Operator So long as CAST is used as shown, we could obtain the total marks for each exam in similar fashion, using SUM (Mark) AS TotalMarks. However, this giv

Use of COUNT in SQL It describes and discusses various general methods of expressing constraints, eventually noting that support for "=" with relation operands is sufficient f


THEO R Y OF ETERNITY OF LIFE (PRAYER - 1880) - The theory of eternity of life, also called the steady-state theory , states that life has ever been in existence as at presen