Question

Difficulty: MediumContinuous and Discontinuous Variation

Match each phenotypic trait or population distribution profile on the left with its corresponding characteristic pattern of variation or graphical feature on the right.

  • Human height and skin colorContinuous variation influenced by polygenes and environmental factors
  • ABO blood group and tongue rolling abilityDiscontinuous variation controlled by monogenic inheritance with minimal environmental effect
  • Bell-shaped frequency curveGraphical representation showing a continuous spectrum of intermediate phenotypes
  • Discrete bar chart with clear gapsGraphical representation showing non-overlapping, distinct phenotypic categories

Answer

Human height and skin color matches with Continuous variation influenced by polygenes and environmental factors. ABO blood group and tongue rolling ability matches with Discontinuous variation controlled by monogenic inheritance with minimal environmental effect. Bell-shaped frequency curve matches with Graphical representation showing a continuous spectrum of intermediate phenotypes. Discrete bar chart with clear gaps matches with Graphical representation showing non-overlapping, distinct phenotypic categories.
Human height and skin color exhibit continuous variation caused by polygenic inheritance and environmental influences. ABO blood group and tongue rolling ability show discontinuous variation controlled by single genes with minimal environmental impact. Population data for continuous variation forms a smooth bell-shaped curve showing intermediate phenotypes, whereas discontinuous variation forms a discrete bar chart with distinct non-overlapping categories.

Step-by-Step Solution

1
Identify the biological nature and genetic control of phenotypic traits
Human height and skin color exhibit gradual transitions (polygenic continuous variation), while ABO blood group and tongue rolling show clear, separate phenotypic classes (monogenic discontinuous variation).
Continuous traits show a continuum of phenotypes due to multiple genes, whereas discontinuous traits show distinct classes due to single-gene control.
2
Analyze the graphical representations associated with population data for both variation types
Continuous data produces a smooth, bell-shaped normal distribution curve, while discontinuous data forms separate bars representing distinct non-overlapping categories.
Quantitative measurements across a spectrum form a continuous curve, while qualitative discrete categories plot as separate bars.
3
Pair each left item with its corresponding genetic mechanism or graphical characteristic
All four pairs are correctly matched based on variation patterns and graphical profiles.
Ensures complete concept alignment across examples, mechanisms, and graphical representations.

Key Concept

Distinction between continuous and discontinuous variation in inheritance patterns, underlying genetic mechanisms, and graphical representations.
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