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Related Concept Videos

Chi-square Analysis02:46

Chi-square Analysis

The chi-square test is a statistical hypothesis test. It is used to check whether there is a significant difference between an expected value and an observed value. In the context of genetics, it enables us to either accept or reject a hypothesis, based on how much the observed values deviate from the expected values.
The chi-square test was developed by Pearson in 1990.
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Trihybrid Crosses

Trihybrid Crosses
Some of Mendel’s crosses examined three pairs of contrasting characteristics. Such a cross is called a trihybrid cross. A trihybrid cross is a combination of three individual monohybrid crosses. For example, plant height (tall vs. short), seed shape (round vs. wrinkled), and seed color (yellow vs. green).
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Most altruistic behavior—in which one animal helps another at a cost to themselves—occurs between relatives. Scientists think these altruistic behaviors evolved because they increase the inclusive fitness of the animal providing help.
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.In the early 20th century,...

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Induction and Evaluation of Inbreeding Crosses Using the Ant, Vollenhovia Emeryi
06:44

Induction and Evaluation of Inbreeding Crosses Using the Ant, Vollenhovia Emeryi

Published on: October 5, 2018

Mate choice for optimal (k)inbreeding.

Mikael Puurtinen1

  • 1Department of Biological and Environmental Science, Centre of Excellence in Evolutionary Research, P.O. Box 35, FI-40014 University of Jyväskylä, Finland. mikael.puurtinen@jyu.fi

Evolution; International Journal of Organic Evolution
|April 28, 2011
PubMed
Summary
This summary is machine-generated.

Incestuous mating can be adaptive by increasing gene representation. New theory suggests optimal inbreeding occurs with intermediate relatedness, aligning with observed mating preferences.

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Area of Science:

  • Evolutionary Biology
  • Behavioral Ecology
  • Population Genetics

Background:

  • Inbreeding depression typically selects against mating between relatives.
  • However, inbreeding can also be adaptive by increasing the proportion of genes identical by descent.
  • Inclusive fitness theory provides a framework for understanding the evolutionary benefits of inbreeding.

Purpose of the Study:

  • To review the theory of inclusive fitness benefits of incest.
  • To extend existing theory by deriving the stable level of inbreeding under optimal mate choice.
  • To investigate the evolutionary stable level of inbreeding that maximizes inclusive fitness.

Main Methods:

  • Developed a theoretical model based on inclusive fitness maximization.
  • Assumed inbreeding depression is a linear function of offspring homozygosity.
  • Derived the stable level of inbreeding predicted by natural selection.

Main Results:

  • The stable level of inbreeding maximizing inclusive fitness is lower than previously theorized.
  • Mating with intermediately related individuals maximizes inclusive fitness across various inbreeding depression strengths.
  • Predicted preference for intermediate relatedness aligns with empirical data.

Conclusions:

  • Natural selection favors intermediate relatedness in mating partners to maximize inclusive fitness.
  • This finding challenges the traditional view that selection solely acts against inbreeding.
  • The results have implications for understanding mating systems and the evolution of social behavior.