Which of the following is true about continuous phenotypic variation and discret

Question

Which of the following is true about continuous phenotypic variation and discrete variation? Select all that apply. O Discrete phenotypic variation is characterized by easily distinguished phenotypic categories. Discrete phenotypic variation is characterized by a range of phenotypes that must be quantitatively measured. Continuous phenotypic variation is characterized by easily distinguished phenotypic categories Continuous phenotypic variation is characterized by a range of phenotypes that must be quantitatively measured. Discrete phenotypic variation can only be caused by alleles that are completely dominant. Continuous phenotypic variation can be caused by many genes affecting a trait and/or environmental variation. Discrete phenotypic variation is commonly caused by environmental variation.

Explanation / Answer

These are true:

Discrete phenotypic variation is characterized by easily distinguished phenotypic categories.

Continuous phenotypic variation is characterized by a range of phenotypes that must be quantitatively measured.

Continuous phenotypic variation can be caused by many genes affecting a trait and/or environmental variation.

Explanation: The answer is based upon the following concept. In discrete phenotypic variation, individuals fall into a distinct class. That is either you have or you dont have the feature. Tongue rolling is such an example. Either you can roll your tongue or you cant. Nothing can happen in between. But, in case of continuous phenotypic variation, a complete range of measurements are there from one extreme to another. Height is an example. Height of 10 trees can be 1,2,3,4,5,6,7,8,11,14 ft.

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