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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.
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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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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.
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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.
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In a study where individuals posing as strangers offered compliments and proposed casual sex to students, the responses differed significantly based on gender. Not a single woman accepted the proposal, while 70% of the men agreed. This outcome provides a useful scenario to explore through the lens of evolutionary psychology and social learning theory, highlighting the diverse perspectives on human sexual behaviors.
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In most mammalian species, females have two X sex chromosomes and males have an X and Y. As a result, mutations on the X chromosome in females may be masked by the presence of a normal allele on the second X. In contrast, a mutation on the X chromosome in males more often causes observable biological defects, as there is no normal X to compensate. Trait variations arising from mutations on the X chromosome are called “X-linked”.
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Sex Stratified Neuronal Cultures to Study Ischemic Cell Death Pathways
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Explaining biological differences between men and women by gendered mechanisms.

Hélène Colineaux1, Lola Neufcourt2, Cyrille Delpierre2

  • 1EQUITY Team, CERPOP, INSERM, 37 Allees Jules Guesde, 31062, Toulouse, France. helene.colineaux@inserm.fr.

Emerging Themes in Epidemiology
|March 24, 2023
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Summary

Biological differences between men and women are influenced by gendered mechanisms, not just biology. Exploring these gender effects offers new insights into health disparities and research approaches.

Keywords:
Allostatic loadBiomarkerCausal frameworkEmbodimentGenderMediation analysisSex

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Area of Science:

  • Sociology
  • Public Health
  • Biomedical Science

Background:

  • Investigating the role of gendered mechanisms in explaining biological differences between sexes.
  • Utilizing data from the 1958 National Child Development Study cohort.

Purpose of the Study:

  • To determine if gendered mechanisms explain biological variations between men and women.
  • To analyze biomarkers including systolic blood pressure, lipids, HbA1c, CRP, and cortisol.

Main Methods:

  • Employed three conceptualizations of gender: individual characteristic, sex effect on socio-behavioral traits, and sex-social environment interaction.
  • Utilized g-computation to estimate the total effect of sex and the proportion mediated by gender.

Main Results:

  • Significant sex differences observed in cardiometabolic, inflammatory, and neuroendocrine biomarkers.
  • Gender mechanisms partially explained these sex-based biological differences, with mediation effects varying.
  • Early-life socioeconomic status interacted with sex, impacting biomarker levels differently in males and females.

Conclusions:

  • Biological differences between sexes are not solely due to biological factors.
  • The study highlights the importance of exploring gender mechanisms for a comprehensive understanding of health.
  • Opens new methodological and application perspectives in sex and gender research.