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Related Experiment Videos

Genic Variation in Male Haploids under Deterministic Selection.

P Pamilo1, R H Crozier

  • 1School of Zoology, University of New South Wales, Kensington, N.S.W., Australia 2033.

Genetics
|May 1, 1981
PubMed
Summary
This summary is machine-generated.

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Male haploids exhibit lower genic variation than male diploids, with differences influenced by selection intensity and fitness correlations. Natural population data align with these trends, suggesting potential factors for observed genic variation patterns.

Area of Science:

  • Population Genetics
  • Evolutionary Biology
  • Molecular Evolution

Background:

  • Understanding genic variation is crucial for evolutionary studies.
  • Comparing genetic variation in male haploid and male diploid systems provides insights into evolutionary dynamics.
  • Previous studies have explored factors influencing genetic variation, but direct comparisons between these systems under controlled conditions are limited.

Purpose of the Study:

  • To compare genic variation between male haploid and male diploid genetic systems.
  • To investigate the influence of fitness correlations (inter-sex and inter-genotype) and selection intensity on genic variation.
  • To evaluate how theoretical predictions align with empirical data from natural populations.

Main Methods:

  • Computer simulations were used to model genic variation under constant fitnesses and infinite population size.

Related Experiment Videos

  • Models varied in fitness correlation between sexes (r(s)) and genotypes (r(g)), and selection intensity (coefficient of variation, CV).
  • Genic variation was quantified by proportion of polymorphic loci (P), gene diversity at polymorphic loci (H(p)), and overall gene diversity (H(a)).

    • Main Results:

    • Male haploids showed significantly lower P and H(a) compared to male diploids; these ratios decreased with increasing r(s), r(g), and CV.
    • H(p) values were similar between the two systems, except for male diploids with r(s)=1.
    • Natural population data qualitatively supported simulation trends, though variation ratios differed, particularly for H(p) when excluding Drosophila.

    Conclusions:

    • Male haploid systems generally exhibit lower genic variation than male diploid systems, influenced by selection and fitness correlations.
    • Observed allele frequency distributions in natural populations deviate from simulations, suggesting roles for stochastic processes or selection-mutation balance.
    • While Drosophila shows high variation, low variation in male haploids compared to diploids is not strongly indicated but could be explained by factors like rapid allele fixation or selection-mutation balance.