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Mate Choice01:20

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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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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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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.
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In most organisms, sex is determined by the ratio of X and Y chromosomes. However, in some organisms, such as Drosophila and C.elegans, sex is determined by the ratio of the number of X chromosomes to the number of sets of autosomes. The Y chromosome in Drosophila is active but does not determine sex. It contains genes responsible for the production of sperms in adult flies.  
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Assessing Differences in Sperm Competitive Ability in Drosophila
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Female extra-pair mating: adaptation or genetic constraint?

Wolfgang Forstmeier1, Shinichi Nakagawa2, Simon C Griffith3

  • 1Department of Behavioural Ecology and Evolutionary Genetics, Max Planck Institute for Ornithology, 82319 Seewiesen, Germany.

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Female animals in socially monogamous species often mate outside their pair bond. This review suggests focusing on non-adaptive explanations, like genetic factors, rather than solely on adaptive benefits for extra-pair copulations.

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Area of Science:

  • Evolutionary biology
  • Behavioural ecology
  • Reproductive science

Background:

  • Socially monogamous species exhibit frequent extra-pair copulations (EPCs) by females.
  • The adaptive significance of female EPCs has been the dominant research focus for over 20 years.

Purpose of the Study:

  • To challenge the prevailing adaptive explanations for female EPCs.
  • To highlight the under-researched role of nonadaptive phenomena in driving EPCs.
  • To advocate for integrating diverse biological fields in future research.

Main Methods:

  • Literature review of existing studies on EPCs in socially monogamous species.
  • Critical analysis of adaptive versus nonadaptive hypotheses for female EPCs.
  • Synthesis of findings from behavioural ecology, reproductive physiology, and evolutionary genetics.

Main Results:

  • Adaptive scenarios for female EPCs have dominated research, potentially overshadowing other explanations.
  • Nonadaptive phenomena, including pathological polyspermy, de novo mutations, and genetic constraints, are frequently overlooked.
  • Empirical and theoretical research has disproportionately focused on female benefits from EPCs.

Conclusions:

  • The current emphasis on adaptive benefits for female EPCs may be misplaced.
  • Nonadaptive factors warrant serious consideration and further investigation.
  • Future research should adopt a multidisciplinary approach, integrating behavioural ecology with reproductive physiology and evolutionary genetics for a comprehensive understanding of EPCs.