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Related Concept Videos

Genetic Drift03:33

Genetic Drift

Natural selection—probably the most well-known evolutionary mechanism—increases the prevalence of traits that enhance survival and reproduction. However, evolution does not merely propagate favorable traits, nor does it always benefit populations.
Mutation, Gene Flow, and Genetic Drift01:09

Mutation, Gene Flow, and Genetic Drift

In a population that is not at Hardy-Weinberg equilibrium, the frequency of alleles changes over time. Therefore, any deviations from the five conditions of Hardy-Weinberg equilibrium can alter the genetic variation of a given population. Conditions that change the genetic variability of a population include mutations, natural selection, non-random mating, gene flow, and genetic drift (small population size).
Hardy-Weinberg Principle01:49

Hardy-Weinberg Principle

Diploid organisms have two alleles of each gene, one from each parent, in their somatic cells. Therefore, each individual contributes two alleles to the gene pool of the population. The gene pool of a population is the sum of every allele of all genes within that population and has some degree of variation. Genetic variation is typically expressed as a relative frequency, which is the percentage of the total population that has a given allele, genotype or phenotype.
What is Population Genetics?01:25

What is Population Genetics?

A population is composed of members of the same species that simultaneously live and interact in the same area. When individuals in a population breed, they pass down their genes to their offspring. Many of these genes are polymorphic, meaning that they occur in multiple variants. Such variations of a gene are referred to as alleles. The collective set of all the alleles within a population is known as the gene pool.
Evolutionary Processes in Microbes01:26

Evolutionary Processes in Microbes

Microbial evolution occurs rapidly due to short generation times and a variety of genetic processes, including horizontal gene transfer, mutation, recombination, and genetic drift. These mechanisms collectively enable microbes to adapt swiftly to changing environments.Horizontal gene transfer (HGT) allows genes to move between different species and occurs through three main mechanisms: conjugation, transformation, and transduction. Conjugation involves direct cell-to-cell contact for DNA...
Instinctive Drift01:05

Instinctive Drift

Instinctive drift refers to the tendency of animals to revert to their innate behaviors despite repeated reinforcement. Breland and Breland demonstrated this concept in an experiment with a raccoon. The raccoon was trained to pick up two coins and place them in a container in exchange for food. Initially, the raccoon learned to associate the coins with food, making them a conditioned stimulus or a substitute for food. However, over time, the raccoon became less willing to put the coins into the...

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High-Throughput Live Imaging of Microcolonies to Measure Heterogeneity in Growth and Gene Expression
12:52

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Published on: April 18, 2021

Biology undergraduates' misconceptions about genetic drift.

T M Andrews1, R M Price, L S Mead

  • 1Department of Ecology, Montana State University, Bozeman, MT 59717, USA.

CBE Life Sciences Education
|September 6, 2012
PubMed
Summary
This summary is machine-generated.

Biology students often misunderstand genetic drift, a key evolutionary mechanism. Even after instruction, most retain misconceptions, highlighting a need for improved teaching strategies for evolution education.

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Area of Science:

  • Biology Education
  • Evolutionary Biology
  • Genetics

Background:

  • Genetic drift is a fundamental mechanism of evolution.
  • Undergraduates often struggle with evolutionary concepts, including genetic drift.
  • Understanding student misconceptions is crucial for effective science education.

Purpose of the Study:

  • To identify and categorize misconceptions about genetic drift among biology undergraduates.
  • To analyze the impact of instruction on students' understanding of genetic drift.
  • To develop a framework for conceptual change regarding genetic drift.

Main Methods:

  • Qualitative and quantitative research methods were employed.
  • Student definitions and conceptions of genetic drift were collected and analyzed.
  • Pre- and post-instruction assessments were conducted.

Main Results:

  • Sixteen distinct misconceptions about genetic drift were identified, grouped into five categories.
  • While instruction improved understanding (p = 0.005), 74.6% of students retained at least one misconception.
  • Student conceptions ranged from superficial knowledge to confusion about nuanced aspects of genetic drift.

Conclusions:

  • Instruction leads to some improvement but does not eliminate misconceptions about genetic drift.
  • A framework for conceptual change in understanding genetic drift is proposed.
  • Hypotheses suggest students progress from undeveloped to complex but inaccurate conceptualizations, with new misconceptions emerging.