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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...
Mate Choice01:20

Mate Choice

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.
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...
Telomeres and Telomerase02:41

Telomeres and Telomerase

In eukaryotic DNA replication, a single-stranded DNA fragment remains at the end of a chromosome after the removal of the final primer. This section of DNA cannot be replicated in the same manner as the rest of the strand because there is no 3’ end to which the newly synthesized DNA can attach. This non-replicated fragment results in gradual loss of the chromosomal DNA during each cell duplication. Additionally, it can induce a DNA damage response by enzymes that recognize single-stranded DNA.
Telomeres and Telomerase02:41

Telomeres and Telomerase

In eukaryotic DNA replication, a single-stranded DNA fragment remains at the end of a chromosome after the removal of the final primer. This section of DNA cannot be replicated in the same manner as the rest of the strand because there is no 3’ end to which the newly synthesized DNA can attach. This non-replicated fragment results in gradual loss of the chromosomal DNA during each cell duplication. Additionally, it can induce a DNA damage response by enzymes that recognize single-stranded DNA.
Frequency-dependent Selection01:21

Frequency-dependent Selection

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.Positive Frequency-Dependent SelectionIn positive...

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Related Experiment Video

Updated: Jun 2, 2026

Monochrome Multiplex Quantitative PCR Telomere Length Measurement
11:44

Monochrome Multiplex Quantitative PCR Telomere Length Measurement

Published on: March 22, 2024

Sexual differences in telomere selection in the wild.

Mats Olsson1, Angela Pauliny, Erik Wapstra

  • 1School of Biological Sciences, University of Sydney, The Heydon-Laurence Building AO8, Sydney, NSW, Australia. mats.olsson@sydney.edu.au

Molecular Ecology
|April 14, 2011
PubMed
Summary

Sand lizard females have longer telomeres and better maintain them throughout life than males. This sexually dimorphic telomere length is driven by past and ongoing selection, influencing lifespan and reproductive success.

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Area of Science:

  • Evolutionary Biology
  • Gerontology
  • Molecular Biology

Background:

  • Telomere length, maintained by telomerase, influences lifespan and can differ between sexes.
  • The reasons for sex-specific telomere length differences (proximate mechanisms vs. evolved adaptations) are often unclear.

Purpose of the Study:

  • To investigate the role of telomere length in lifespan and reproductive success in sand lizards (Lacerta agilis).
  • To determine if sexually dimorphic telomere dynamics in sand lizards are shaped by selection.

Main Methods:

  • Quantified telomere length and its maintenance across lifespan in male and female sand lizards.
  • Analyzed the contribution of telomere length, lifespan, and body size to lifetime reproductive success.
  • Conducted selection analyses on recruitment of offspring, comparing data from Telometric and ImageJ software.

Main Results:

  • Sand lizard females exhibit longer telomeres and better telomere maintenance than males.
  • Telomere length more strongly influences lifespan and reproductive success in females.
  • Selection analyses revealed significant, sex-specific selection pressures, with strong ongoing selection in females accounting for 63% of recruitment variation.
  • ImageJ software produced comparable selection pattern results despite shorter average telomere lengths.

Conclusions:

  • Sexually dimorphic telomere dynamics in sand lizards are a result of past and ongoing selection.
  • Telomere length plays a crucial role in female reproductive success and lifespan, indicating adaptive significance.