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Related Concept Videos

Natural Selection and Mating Preferences01:06

Natural Selection and Mating Preferences

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, inherently...
Mismatch Repair01:20

Mismatch Repair

Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
The Mutator Protein Family Plays a Key Role in DNA Mismatch Repair
The human genome has more than 3 billion base pairs of DNA per cell. Prior to cell division, that vast amount of genetic...
Mismatch Repair01:36

Mismatch Repair

Overview
Types of Selection01:46

Types of Selection

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...
Dosage Compensation02:50

Dosage Compensation

In animals, gender is determined by the number and type of sex chromosome. For example, human females have two X chromosomes, and males have one X and one Y chromosome, whereas C.elegans with one X chromosome is a male, and the one with two X chromosomes is a hermaphrodite.
In addition to sexual development, the X chromosome has genes involved in autosomal functions such as brain development and the immune system. Therefore, males and females with  distinct numbers of X chromosomes will have...
The Y Chromosome Determines Maleness02:19

The Y Chromosome Determines Maleness

The Y chromosome is a sex chromosome found in several vertebrates and mammals, including humans. In addition to 22 pairs of autosomes, the human males have one X chromosome and one Y chromosome. In these organisms, the presence or absence of the Y chromosome determines the development of male traits.
Evolution
Around 300 million years ago, the two sex chromosomes diverged from two identical autosomal chromosomes. Over time, the Y chromosome has lost most of its genes, shrinking in size. Today,...

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Related Experiment Video

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Transgenic Rodent Assay for Quantifying Male Germ Cell Mutant Frequency
14:45

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Published on: August 6, 2014

Reducing mutation load through sexual selection on males.

Katrina McGuigan1, Donna Petfield, Mark W Blows

  • 1School of Biological Sciences, The University of Queensland, St Lucia, Queensland 4072, Australia. k.mcguigan1@uq.edu.au

Evolution; International Journal of Organic Evolution
|October 5, 2011
PubMed
Summary
This summary is machine-generated.

Sexual selection reduces mutation accumulation and fitness costs in males. This highlights the importance of studying mutation load and sexual selection for understanding evolutionary processes.

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Area of Science:

  • Evolutionary biology
  • Genetics
  • Behavioral ecology

Background:

  • Mutation load is crucial in evolutionary theory, yet empirical data on its levels and elimination by selection are scarce.
  • Understanding how sexual selection impacts mutation accumulation and fitness is vital for evolutionary insights.

Purpose of the Study:

  • To investigate the effect of sexual selection on males on the accumulation of mutations affecting both sexual and nonsexual fitness components.
  • To explore the role of sexual selection in mitigating mutation load and its consequences.

Main Methods:

  • A mutation accumulation divergence experiment was employed, manipulating the opportunity for sexual selection in males.
  • Fitness components, including male mating success and productivity, were measured to assess mutation load and its correlation with sexual selection.

Main Results:

  • Sexual selection effectively prevented the accumulation of mutations impacting male mating success and reduced mutation load on productivity.
  • Positive mutational correlations between mating success and productivity were significantly reduced by sexual selection.
  • Divergence in male mating success was observed, but context-dependency of mutational effects on mating success was noted.

Conclusions:

  • Sexual selection plays a significant role in purging deleterious mutations, particularly those affecting fitness components.
  • Focusing on mutational variation and trait variances, rather than standing variation and means, offers deeper insights into selection's genetic targets.
  • The context-dependent nature of mutational effects underscores the complexity of evolutionary processes.