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This question is related to the concept of continuous and discontinuous variation in human traits. It asks which of the listed characteristics exhibits discontinuous variation.
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The characteristic that shows discontinuous variation in humans is C) Tongue rolling. This trait is typically determined by a single gene with two distinct alleles, making it a classic example of a discontinuous or Mendelian trait. Individuals can either roll their tongues (homozygous dominant) or not roll their tongues (homozygous recessive).
The characteristic that exhibits discontinuous variation in humans is C) Tongue rolling. This trait is controlled by a single gene with two distinct alleles, leading to a clear dichotomy in the population—individuals can either roll their tongues (homozygous dominant) or not roll them (homozygous recessive). This represents a classic example of discontinuous or Mendelian variation.
The characteristic that demonstrates discontinuous variation in humans is C) Tongue rolling. This trait is determined by a single gene with two distinct alleles, resulting in a distinct binary outcome: individuals can either roll their tongues (homozygous dominant) or not roll them (homozygous recessive). This clear-cut distinction is a hallmark of discontinuous variation.