Hereditary Variation, Biology tutorial


Hereditary variation signifies to differences among individuals that can be passed from parents to their offspring (or progeny). Hereditary variation occurs because of the transmission of varieties in traits and in parents as in the case of identical twins, no two offspring inherit precisely the similar set of features from their parents. Each and every offspring inherits a dissimilar combination of features from parents. The differences among individuals of the similar species are termed as Variations.

Types of Variation:

There are many kinds of variation as noticed in populations.

1) Morphological variation:

This kind of variation is a result of group of differences that relate to the physical appearance example: Human beings differ in physical features like:

  • Height of the body.
  • Color of parts of the body like hair, skin and eyes
  • Sizes of different parts of the body comprising head, nose, eyes, ears, jaw, hands and chest.
  • Shapes of different parts of the body like head, forehead, nose, mouth and jaw.
  • Finger-prints.

2) Physiological variation:

It is a kind of variation or differences which associate to the functioning of the body and are termed as physiological variations. Examples comprise:

  • Moving ears devoid of moving the head.
  • Rolling of the tongue.
  • Tasting the chemical material termed phenylthiocartamide (PTC)
  • Closing of one eye and parting the other eye partially open
  • There are four dissimilar blood groups in human beings, A, B, AB and O. Each and every person consists of only one of such blood groups.

3) Genetic Variation:

At times in nature, various changes all of a sudden take place in the chromosomes devoid of necessarily destroying them. These changes are termed as mutation and might simply comprise a modification in position of various genes or even the whole chromosomes. If mutation takes place, this will lead to the production of offspring with marked differences in appearance from their members and these offspring are generally termed as variant or varieties.

4) Environmental variations:

Possibly the highest factor generating variation is the result of the environment on the individual. An individual might be potentially tall however remains short due to poor feeding. The environmental factors like temperature, rain-fall and sunlight can as well bring about sharp variations among the individual members of the similar family. The appearance of an individual based on the degree to which he has been influenced by such environmental factors. Some of these factors are affluence, poverty, hard-work, laziness, sorrows, thoughts, food, restlessness, diseases and weather situations among others.

Application of Variation:

1) Crime Detection:

If a criminal is required, police detectives employ the suspect's morphological characteristics to mount a search. These morphological traits might comprise height, color of hair, color of skin, color of eyes and so on.

Finger-prints are as well employed in crime detection, example: If an object is found at the sight of the crime, finger-prints might be found on the object; these are compared with such of a suspect. Any individual whose finger-print matches such found on the object at the sight of the crime might be accused in the court of law as an accused person. The utilization of finger-prints in crime detection depends on the fact that no two individuals have precisely the similar fingerprints and that the fingerprints of an individual don't change all through life.

2) Blood Transfusion:

Blood groups are characterized through specific proteins in the red blood cells termed as antigens. Antigens are substances which can stimulate the production of antibodies. It is significant that the blood of a donor matches the blood of a recipient; or else there could be serious effects, comprising death.

Determination of the Paternity:

At times the paternity of a child becomes a source of dispute. One technique of resolving the dispute is to find out the blood group of the child, the blood group of the disputing fathers and the blood group of the child's mother. From the outcome of the bond group test, it might be possible to find out the paternity of the child.

Variation gives a Mark of Identity:

As variation is a general feature among the living things, it gives a clear mark of identity among organisms of the similar species. Among the human beings, variation in finger prints is employed to recognize a person because of definite characters of the finger print. For illustrations: at Banks and all through elections.

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