Sex: differences in mutation, recombination, selection, gene flow, and genetic drift

Area of Science:

• Evolutionary biology
• Population genetics
• Genetics

Background:

• Significant sex-specific differences exist in fundamental evolutionary processes.
• These include mutation rates, recombination frequencies, natural selection, gene flow, and genetic drift.

Purpose of the Study:

• To review and synthesize the current understanding of sex-specific differences in evolutionary factors.
• To explore the underlying causes and implications of these differences in biological populations.

Main Methods:

• Review of existing literature on sex-specific evolutionary rates.
• Analysis of genetic and molecular data to identify patterns and mechanisms.
• Synthesis of hypotheses explaining observed sex differences.

Main Results:

• Mutation rates are frequently higher in males, potentially due to more cell divisions.
• Recombination rates show variation, often higher in females, but with notable exceptions.
• Sex-specific selection can drive rapid evolution, polymorphisms, and sexually antagonistic genes.
• Gene flow (dispersal) exhibits significant sex differences with adaptive explanations.
• Genetic drift is primarily influenced by the sex with the smaller effective population size.

Conclusions:

• Sex-specific differences in evolutionary factors are multifaceted and often independent of each other.
• Explanations range from adaptive evolutionary pressures to nonadaptive or mechanistic causes.
• Understanding these differences is crucial for accurate population genetics modeling and evolutionary studies.