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Related Concept Videos

Mate Choice01:20

Mate Choice

11.4K
Mate choice—the decision about whom to mate with—is a type of natural selection, since animals must reproduce to pass down their genes. Mate choice is also called intersexual selection because the behavior occurs between the sexes.
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Natural Selection and Mating Preferences01:06

Natural Selection and Mating Preferences

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The principle of natural selection posits that organisms better adapted to their environment are more likely to survive and reproduce. This principle is closely intertwined with mating preferences, a key aspect of sexual selection, which evolutionary psychologists believe is driven by instincts to propagate one's genes. Such instincts significantly influence mating behaviors and preferences between genders.
Females, due to their biological roles in conception, pregnancy, and nursing,...
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Inclusive Fitness00:57

Inclusive Fitness

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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.
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Frequency-dependent Selection01:21

Frequency-dependent Selection

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When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.
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Hardy-Weinberg Principle01:49

Hardy-Weinberg Principle

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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.
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Testing a Claim about Population Proportion01:24

Testing a Claim about Population Proportion

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A complete procedure for testing a claim about a population proportion is provided here.
There are two methods of testing a claim about a population proportion: (1) Using the sample proportion from the data where a binomial distribution is approximated to the normal distribution and (2) Using the binomial probabilities calculated from the data.
The first method uses normal distribution as an approximation to the binomial distribution. The requirements are as follows: sample size is large...
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Related Experiment Video

Updated: Dec 20, 2025

Using the FishSim Animation Toolchain to Investigate Fish Behavior: A Case Study on Mate-Choice Copying In Sailfin Mollies
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Condition-Dependent Mutual Mate Preference and Intersexual Genetic Correlations for Mating Activity.

Chang S Han, Robert C Brooks, Niels J Dingemanse

    The American Naturalist
    |May 30, 2020
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    Diet quality significantly impacts mutual mate preferences and genetic correlations in crickets. Stressful diets weaken mating preferences and genetic links, highlighting environmental effects on sexual selection.

    Keywords:
    condition dependencedietindirect genetic effectintersexual genetic correlationmutual mate preferencestress

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    Area of Science:

    • Evolutionary Biology
    • Behavioral Ecology
    • Genetics

    Background:

    • Mate preference studies traditionally focus on one sex, neglecting mutual preferences.
    • The condition-dependence and genetic basis of mutual mate preferences are understudied.
    • Understanding mutual preferences is crucial for the evolution of mating behaviors.

    Purpose of the Study:

    • To investigate the condition-dependence of mutual mate preferences.
    • To assess intersexual genetic correlations for mating activity under varying environmental conditions.
    • To explore how diet quality influences the expression of mating behaviors and preferences.

    Main Methods:

    • Measured male and female mate preferences in southern field crickets (Gryllus bimaculatus).
    • Assessed intersexual genetic correlations for mating activity in pedigreed populations.
    • Compared preferences and genetic correlations under favorable (free-choice) and stressful (protein-deprived) diets.

    Main Results:

    • Mutual mate preferences were strong in a favorable diet but weak under a stressful diet.
    • Intersexual genetic covariance for mating activity was high (near one) in a favorable diet.
    • Intersexual genetic covariance for mating activity was significantly lower than one in a stressful diet.

    Conclusions:

    • Dietary environments critically affect the expression of genetic variation in mating behaviors.
    • Stressful environments reduce both the strength of mutual mate preferences and intersexual genetic covariance.
    • Mating dynamics exhibit significant environmental variation, impacting sexual selection.