= G. A. Parker
{c}
<G. A. Parker> coauthored a 1972 evolutionary model for the origin of <anisogamy>, the difference between small and large <gametes>. The model connected the number of gametes a producer can make with the resources available to a resulting <zygote>. Producing many small <gametes> can improve opportunities for fusion, whereas larger <gametes> can improve provisioning; these pressures need not favor one intermediate size.<The origin and evolution of gamete dimorphism and the male-female phenomenon by G. A. Parker and others>[Journal of Theoretical Biology 36, 529–553, gamete-size model]{ref}
The contribution made the origin of two gamete-size strategies a problem in <natural selection>. It explained a possible mechanism under explicit reproductive assumptions, rather than making every observed sex difference a necessary consequence of <anisogamy>.
\Image[https://www.liverpool.ac.uk/people/geoff-parker/photo]
{title=Portrait of <G. A. Parker>}
{description=Identified University of Liverpool faculty portrait; the GAP faculty profile links the gamete-dimorphism research.}
{source=https://www.liverpool.ac.uk/people/geoff-parker}
{width=260}
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