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Related Concept Videos

Mate Choice01:20

Mate Choice

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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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Natural Selection and Mating Preferences01:06

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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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Types of Selection01:46

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Natural selection influences the frequencies of particular alleles and phenotypes within populations in several different ways. Primarily, natural selection can be directional, stabilizing, or disruptive. Directional selection favors one extreme trait and shifts the population towards that phenotype while selecting against individuals displaying alternate traits. Stabilizing selection favors an intermediate trait with a narrow range of variation. Deviation from the optimal phenotype towards an...
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Testing a Claim about Population Proportion01:24

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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.
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Law of Independent Assortment02:03

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Law of Independent Assortment02:03

Law of Independent Assortment

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While Mendel’s Law of Segregation states that the two alleles for one gene are separated into different gametes, a different question of how different genes are inherited remains. For example, is the gene for tall plants inherited with the gene for green peas? Mendel asked this question by experimenting with a dihybrid cross; a cross in which both parents are homozygous for two distinct traits resulting in an F1 generation that are heterozygous for both traits.
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Related Experiment Video

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Assessing Differences in Sperm Competitive Ability in Drosophila
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Sexual selection and assortative mating: an experimental test.

A Debelle1, M G Ritchie2, R R Snook3

  • 1School of Life Sciences, University of Sussex, Brighton, UK.

Journal of Evolutionary Biology
|March 13, 2016
PubMed
Summary
This summary is machine-generated.

Sexual selection intensity impacts assortative mating. In Drosophila, intense sexual selection (polyandry) led to males dominating mating, overriding female choice, suggesting competition influences sexual isolation.

Keywords:
Drosophilaexperimental evolutionfemale preferencemate competitionsexual conflictsexual isolationspeciation

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Area of Science:

  • Evolutionary Biology
  • Behavioral Ecology
  • Genetics

Background:

  • Mate choice and competition drive sexual isolation.
  • Divergent traits and preferences can lead to assortative mating.
  • Mate competition can counteract mate choice, reducing assortative mating.

Purpose of the Study:

  • To investigate assortative mating in Drosophila pseudoobscura populations.
  • To determine the influence of experimentally evolved sexual selection intensity on mating behavior.
  • To test if mate competition or mate choice dominates when sexual selection differs between populations.

Main Methods:

  • Experimental evolution of Drosophila pseudoobscura under high (polyandry) and low (monogamy) sexual selection for 100 generations.
  • Utilizing a two males: one female mating design to observe interactions.
  • Measuring mating latency and mating probability to assess assortative mating patterns.

Main Results:

  • Females from monogamous populations showed reluctance to mate with males from polyandrous populations.
  • Males from polyandrous populations had a higher probability of mating, irrespective of female origin.
  • Mating latency indicated subtle but complex male-female interaction effects.

Conclusions:

  • Experimental evolution under differing sexual selection intensities alters mating dynamics.
  • Mate competition effects, driven by sexual selection intensity, can override mate choice.
  • Sexual selection intensity is a key factor in the evolution of sexual isolation.