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Zorluk: KolayContinuous and Discontinuous Variation

During a biology practical session, students recorded various inherited characteristics in their peer group. Which of the following traits demonstrates discontinuous variation?

  1. A
    Height
  2. ABO blood groupCevap
  3. C
    Body weight
  4. D
    Skin color

Cevap

ABO blood group
ABO blood group exhibits discontinuous variation because individuals fall into clear-cut, distinct phenotypic categories (A, B, AB, and O) without intermediate phenotypes, and the trait is strictly inherited without environmental modification.

Adım Adım Çözüm

1
Identify the distinguishing characteristic of discontinuous variation.
Discontinuous variation produces distinct, non-overlapping phenotypic categories without intermediate forms, usually under monogenic control.
Qualitative traits are determined by major alleles at one or very few gene loci.
2
Evaluate the phenotypic distribution of each listed trait.
Height, body weight, and skin color display continuous gradations across a population spectrum. In contrast, ABO blood group classifies individuals strictly into discrete groups (A, B, AB, or O).
Blood groups show clear-cut phenotypic distinction unaffected by environmental factors.

Anahtar Kavram

Discontinuous phenotypic variation in human traits
Tahmini Süre:45s
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Konular

Continuous and Discontinuous Variation

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