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Difficulty: EasyModern Evolutionary Theory and Genetic Basis of Evolution

Match each evolutionary concept in modern evolutionary theory (Neo-Darwinism) to its corresponding genetic description or effect.

  • Gene mutationServes as the primary source of new genetic variations and alleles
  • Natural selectionDrives non-random differential reproductive success of advantageous phenotypes
  • Gene poolComprises the total sum of all genes and alleles within a population
  • Genetic driftCauses random changes in allele frequencies, particularly in small populations

Answer

Gene mutation matches with being the primary source of new genetic variations; Natural selection matches with driving non-random differential reproductive success; Gene pool matches with comprising the total sum of all genes and alleles; Genetic drift matches with causing random changes in allele frequencies in small populations.
In modern evolutionary theory (Neo-Darwinism), gene mutations supply new genetic variation; natural selection non-randomly increases adaptive allele frequencies; the gene pool represents all existing population alleles; and genetic drift causes random frequency changes, especially in small isolated groups.

Step-by-Step Solution

1
Identify the origin of new genetic diversity.
Gene mutation is recognized as the ultimate source of novel alleles.
Mutations introduce new genetic changes into the DNA of organisms.
2
Identify the mechanism that acts selectively on beneficial phenotypes.
Natural selection leads to differential reproductive success based on fitness.
Organisms best adapted to their environment pass on advantageous traits to offspring.
3
Define the collective genetic material of a population.
The gene pool consists of all alleles present across all individuals in the population.
Evolution in modern synthesis is defined as changes in allele frequencies within this gene pool.
4
Identify the mechanism of random, chance-based genetic frequency changes.
Genetic drift produces random fluctuations in allele frequencies, most notably in small populations.
Chance events rather than environmental adaptation govern genetic drift.

Key Concept

Mechanisms of Modern Evolutionary Synthesis and Population Genetics
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Topics

Modern Evolutionary Theory and Genetic Basis of Evolution

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