Question

What is the meaning of variation?

Answer 1

Variation:

1. Each person has unique features or characters which enable you to differentiate him or her from other friends.
2. No two people are exactly the same.
3. These differences among individuals in a population or as a species are called a variation.
4. The difference may be the result of genetic differences, the influences of the environment, or a combination of genetic and environmental influences.
5. In humans usually, the characters referred to are the physical characters such as height, weight, skin color, etc.
6. The differences in the physiological processes such as blood glucose level and immunity level are also considered.

Types of variation:

Continuous variation:

1. The characteristics can be measured or graded on a scale such as human heights, weight, skin color, etc.
2. They cannot be grouped into distinct and discrete phenotypes.
3. They are very low individuals who are very short or very tall.

Discontinuous variation:

1. The characteristics are discrete and cannot be measured or graded on a scale such as ABO blood group, color blindness, presence or absence of earlobe, etc.
2. Usually determined by a single gene with a distinct effect
3. Discrete distribution is obtained.