Biology SS 3 Second Term Week: 3
Topic: Variation in Population
Introduction
A population is defined as a group of organisms of the same species living in a specified area within a given period of time. All human beings in one geographical area constitute a population of human beings. Also, all cowpea plants in one geographical area at a given time form the population of cowpea plants.
Variation is defined as the differences which exist between individuals of the same species. All members of a population have some characteristics in common, by which they can be recognized as members of the species. At the same time, members of the same species have individual differences.
Types of Variations
There are two types of variation. These are:
Morphological Variation: This refers to the noticeable physical appearance of individuals of the same species. Morphological variation in turn gives rise to continuous variation. Continuous variation is variation that has no limit on the value that can occur within a population. Some examples of continuous variation are height, weight, heart rate, finger length, leaf length.
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