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Related Concept Videos

Evolutionary Psychology01:20

Evolutionary Psychology

Evolutionary psychology explores the origins of human behavior and mental processes by framing them within the context of natural selection, a theory famously propounded by Charles Darwin. This field asserts that many behaviors common across human societies — ranging from instinctive fear reactions to complex social interactions — arose as evolutionary adaptations. These adaptations enhanced the survival and reproductive success of our ancestors, thereby becoming embedded in the human psyche...
Criticisms of the Evolutionary Perspective01:23

Criticisms of the Evolutionary Perspective

In a study where individuals posing as strangers offered compliments and proposed casual sex to students, the responses differed significantly based on gender. Not a single woman accepted the proposal, while 70% of the men agreed. This outcome provides a useful scenario to explore through the lens of evolutionary psychology and social learning theory, highlighting the diverse perspectives on human sexual behaviors.
Evolutionary psychology provides one explanation for these findings, suggesting...
Limits to Natural Selection01:38

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Organisms that are well-adapted to their environment are more likely to survive and reproduce. However, natural selection does not lead to perfectly adapted organisms. Several factors constrain natural selection.For one, natural selection can only act upon existing genetic variation. Hypothetically, redtusks may enhance elephant survival by deterring ivory-seeking poachers. However, if there are no gene variants—or alleles—for redtusks, natural selection cannot increase the prevalence of...
Genetics of Speciation02:16

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Speciation is the evolutionary process resulting in the formation of new, distinct species—groups of reproductively isolated populations.The genetics of speciation involves the different traits or isolating mechanisms preventing gene exchange, leading to reproductive isolation. Reproductive isolation can be due to reproductive barriers that have effects either before or after the formation of a zygote. Pre-zygotic mechanisms prevent fertilization from occurring, and post-zygotic mechanisms...
Convergent Evolution01:54

Convergent Evolution

Evolution shapes the features of organisms over time, ensuring that they are suited for the environments in which they live. Sometimes, selection pressure leads to the rise of similar but unrelated adaptations in organisms with no recent common ancestors, a process known as convergent evolution.The structures that arise from convergent evolution are called analogous structures. They are similar in function even if they are dissimilar in structure. Further, structures can be analogous while also...
Hypothesis: Accept or Fail to Reject?01:17

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The outcome of any hypothesis testing leads to rejecting or not rejecting the null hypothesis. This decision is taken based on the analysis of the data, an appropriate test statistic, an appropriate confidence level, the critical values, and P-values. However, when the evidence suggests that the null hypothesis cannot be rejected, is it right to say, 'Accept' the null hypothesis?
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Resurrection of Dormant Daphnia magna: Protocol and Applications
07:37

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Published on: January 19, 2018

Hedging one's evolutionary bets, revisited.

T Philippi1, J Seger

  • 1Tom Philippi and Jon Seger are at the Dept of Biology, University of Utah, Salt Lake City, UT 84112, USA.

Trends in Ecology & Evolution
|January 14, 2011
PubMed
Summary
This summary is machine-generated.

Evolutionary bet-hedging balances fitness mean and variance, potentially favoring reduced mean fitness phenotypes for survival. This strategy, theorized in the 1970s, is increasingly observed across diverse plant and animal species.

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Area of Science:

  • Evolutionary biology
  • Quantitative genetics

Background:

  • Evolutionary bet-hedging is a strategy where organisms reduce the variance in their fitness, even if it means reducing the average fitness.
  • This strategy is thought to be adaptive in unpredictable environments.

Purpose of the Study:

  • To review the theory and empirical evidence for evolutionary bet-hedging.
  • To highlight the potential prevalence of bet-hedging in natural populations.

Main Methods:

  • Literature review of theoretical and empirical studies on bet-hedging.
  • Synthesis of findings from diverse taxa.

Main Results:

  • Bet-hedging theory predicts a trade-off between mean fitness and fitness variance.
  • Phenotypes with lower mean fitness but also lower variance can be favored.
  • Empirical evidence suggests bet-hedging occurs in various plant and animal species.

Conclusions:

  • Evolutionary bet-hedging is a significant evolutionary strategy.
  • Further research is needed to fully understand its mechanisms and prevalence.