Hrdy

S. B. Hrdy
 * Origin of size difference**

Chance size difference in single cell gametes

-> 2 types

... || ...Small || ........for resources || ...........Competition ...........for access ... ||
 * ......................Large
 * .........Competition
 * Even larger || ...................Smaller & maneuverable ||

= grand rules for males & females*

"preying" "taking hostage" ||
 * "Hardier...................................... || "con-artist"

Fusion -> sexual recombination -> Hedge against fluctuations

> * Size difference among males & females occurs in whole organisms, so why does the egg-sperm difference show anything about sexual differences? > Moreover, sperm and egg are not male & female. (Indeed, in mammals, sperm determines sex.) > Why not stay big in the competition? > Why not fuse two big cells to get through hard times? > Why fuse at all? > Is this story only relevant to sexual organisms? What fraction of species are sexual? > Is the hedge against fluctuations accepted as explanation of why sex? (Alternatives?)