science
Grade-10
Easy

Question

Which of the following is a genetically inherited human characteristic that is not affected by any changes in environmental conditions?
I. Skin color
II. Blood group
III. Presence of a dimple
IV. Height

  1. I and II  
  2. I and III
  3. II and III
  4. III and IV

hintHint:

These traits have limited range of expression.

The correct answer is: II and III


    Variation within a population can be due to the expression of genes or influence of environment.
    Traits like height, weight, skin color are due to combination of genes and environmental factors. The variation cannot be limited to a specific range in these traits. These are called continuous variation.
    Certain traits like dimples, blood groups have limited range of expression. These traits are due to the expression of a particular gene. Environment does not effect. This type of variation is called discontinuous variation.

    • Traits under discontinuous variation have limited range 
    • Traits under continuous variation have unlimited range 
    • Discontinuous variation is due to the influence of genes alone
    • Continuous variation is due to the combined effects of genes and environment

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