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Differences in the effective population sizes of males and females do not require differences in their distribution of offspring number

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  • Mendez, Fernando L.

Abstract

Difference in male and female effective population sizes has, at times, been attributed to both sexes having unequal variance in their number of offspring. Such difference is paralleled by the relative effective sizes of autosomes, sex chromosomes, and mitochondrial DNA. I develop a simple framework to calculate the inbreeding effective population sizes for loci with different modes of inheritance. In this framework, I separate the effects due to mating strategy and those due to genetic transmission. I then show that, in addition to differences in the variance in offspring number, skew in the male/female effective sizes can also be caused by family composition. This approach can be used to illustrate the effect of induced behaviors on the relative male and female effective population sizes. In particular, I show the impact of the one-child policy formerly implemented in the People’s Republic of China on the relative male and female effective population sizes. Furthermore, I argue that, under some strong constraints on family structure, the concepts of male and female effective population sizes are invalid.

Suggested Citation

  • Mendez, Fernando L., 2017. "Differences in the effective population sizes of males and females do not require differences in their distribution of offspring number," Theoretical Population Biology, Elsevier, vol. 114(C), pages 19-28.
    • Handle: RePEc:eee:thpobi:v:114:y:2017:i:c:p:19-28
    DOI: 10.1016/j.tpb.2016.11.002
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    References listed on IDEAS

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    1. Ramachandran, Sohini & Rosenberg, Noah A. & Feldman, Marcus W. & Wakeley, John, 2008. "Population differentiation and migration: Coalescence times in a two-sex island model for autosomal and X-linked loci," Theoretical Population Biology, Elsevier, vol. 74(4), pages 291-301.
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