Mike Speciner wrote: << OK, but what are the plausible heredity rules that preserve the relevant ratios in the steady state (i.e., without the termination rule)? (By "plausible", I mean conforming to standard human genome kinds of things--gender determination from XvY sperm, mitochondrial genome from mother, mother-father gene pairs for everything else.) Presumably, the children of the two kinds of couples are genetically different in some way. What are the coupling rules that preserve the ratios, remembering that you need a boy to couple with a girl, and we probably need to assume monogamy to apply the "stop at first boy" rule (although it could be applied to just one parent, taking just that parent out of the reproducing pool). Assume a finite population, so at least some "interracial" coupling is required in the steady state.

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I just don't know enough biology to translate this question into a mathematical one. But if you restated it in math language, that would help (at least) me. --Dan I sleep as fast as possible so I can get more rest in the same amount of time.