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Sex determining mechanisms: an evolutionary perspective.

J J Bull

    Experientia
    |October 15, 1985
    PubMed
    Summary
    This summary is machine-generated.

    Evolutionary transitions between sex determination systems, including male/female heterogamety and environmental determination, are possible. No intrinsic problems exist at the sex ratio selection level for these evolutionary changes.

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    Area of Science:

    • Evolutionary Biology
    • Genetics
    • Reproductive Biology

    Background:

    • Sex determination mechanisms vary widely across species, including male and female heterogamety, environmental sex determination, haplo-diploidy, and hermaphroditism.
    • Understanding the evolution of these diverse mechanisms is crucial for comprehending reproductive strategies and speciation.

    Purpose of the Study:

    • To review theories on the evolution of various sex determining mechanisms.
    • To explore evolutionary questions regarding the variety, transitions, and reasons for changes in sex determination systems.
    • To identify general principles governing the evolution of sex determination.

    Main Methods:

    • Review of existing theories and literature on sex determination evolution.
    • Analysis of evolutionary questions applied to different sex determining mechanisms.

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  • Illustration of evolutionary transitions using examples of male/female heterogamety, environmental sex determination, haplo-diploidy, and hermaphroditism.

    • Main Results:

    • Sex determining mechanisms are amenable to evolutionary analysis concerning their variety, pathways of change, and selective pressures.
    • Straightforward evolutionary transitions between different sex determining mechanisms are possible under various conditions.
    • No intrinsic problems were identified at the level of sex ratio selection for evolving between mechanisms.

    Conclusions:

    • The evolution of sex determination systems is characterized by accessible transitions between different mechanisms.
    • Sex ratio selection does not present fundamental barriers to evolving new sex determination strategies.
    • Further research can explore the specific conditions and selective forces driving these evolutionary transitions.