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Difficulty: Very hardHuman Morphological and Physiological Variations

Match each example of human physiological or morphological variation on the left with its corresponding underlying characteristic or pattern of inheritance on the right.

  • Sickle cell hemoglobin traitPhysiological variation maintained in populations via heterozygote advantage against malaria
  • Fingerprint ridge patternMorphological discontinuous variation determined fully before birth and permanent throughout life
  • Adult body height distributionMorphological continuous variation governed by polygenic inheritance and environmental factors
  • ABO blood group classificationPhysiological discontinuous variation characterized by discrete biochemical phenotypes governed by multiple alleles

Answer

Sickle cell hemoglobin trait matches with Physiological variation maintained in populations via heterozygote advantage against malaria; Fingerprint ridge pattern matches with Morphological discontinuous variation determined fully before birth and permanent throughout life; Adult body height distribution matches with Morphological continuous variation governed by polygenic inheritance and environmental factors; ABO blood group classification matches with Physiological discontinuous variation characterized by discrete biochemical phenotypes governed by multiple alleles.
Each matching pair accurately connects the specific human variation type to its physiological or morphological classification, genetic basis, and environmental sensitivity.

Step-by-Step Solution

1
Distinguish between morphological (structural/external physical form) and physiological (functional/biochemical process) variations.
Fingerprint patterns and height are identified as morphological variations, while sickle cell trait and ABO blood group are identified as physiological variations.
Classification relies on whether the variation is visible externally (structural) or operates internally at the cellular/biochemical level (functional).
2
Classify each trait by distribution pattern (continuous vs discontinuous).
Height displays continuous variation across a spectrum; blood groups, fingerprints, and hemoglobin traits show clear-cut discontinuous categories.
Continuous traits show a range of intermediate phenotypes, whereas discontinuous traits fall into distinct, non-overlapping phenotypic classes.
3
Correlate specific biological mechanisms and environmental interactions to each matched pair.
Heterozygote advantage corresponds to sickle cell carrier status; polygenic inheritance and nutrition correspond to height; complete genetic determination before birth corresponds to fingerprint patterns; and multiple alleles at a single locus correspond to ABO blood groups.
Matching requires pairing the precise physiological/morphological trait to its specific genetic and evolutionary behavior.

Key Concept

Human Morphological and Physiological Variations
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Topics

Human Morphological and Physiological Variations

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