Physiological variation in human population is evidenced in the…
Physiological variation in human population is evidenced in the
A. difference in the fingerprints
B. physical appearance of individuals
C. differences in height and weight
D. ability to roll the tongue
The major difference between morphological variation and physiological variation lies in the underlying meaning behind the words- ‘morphology’ and ‘physiology’.
While morphology simply means those physical attributes observable in humans, physiology has to do with function of body parts.
Now for the right answer to the above question:
- Option A is incorrect; difference in fingerprints is an observable physical attribute, hence morphological.
- Option B is also incorrect. Physical appearance of individuals not physiological but morphological.
- C is incorrect; differences in height and weight are observable without underlying actions.
- D is the correct answer; ability to roll the tongue has underlying genetic functions.
You may please note that:
- Ability to roll the tongue suggests an action and by extension some underlying function, this is why it is physiological.
- Morphological variation has nothing to do with action or function exhibited by any body part.
- Other examples of physiological variation are: blood group, colour blindness, Haemophilia… (diseases and functional defects fall under physiological variation)
- Examples of morphological variation are: skin colour, height, hair colour, finger print, weight…
Use the questions and answers session to raise further questions and deal more on this topic…
/ culled from 2016 JAMB-UTME biology past question 45 /
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