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[Reelya]

It entirely depends on how Toady specifies the parameters.

The simplest way would be that each species has a stats range for all stats, and two parents produce offspring with a mix of genes for that stat. Note, you have to keep the genes from each parent separate, rather than store 1 gene as an average, otherwise all genomes tend towards the middle over time.

So for proper hereditary traits, each organism needs 2 genes per trait.

And each species will most likely have a min and max value for each trait that these genes represent. So no, it's unlikely cow breeding will give you elephant-sized cows.

[MDFification]

Something I'd like to see added; mutators. Each generation has a chance to be a tad higher or, more likely, a tad lower in an attribute than otherwise specified. This was evolution actually occurs (albiet very, very slowly) rather than a diverse population of dwarves gradually changing to a homogenous but superficially diverse race of ubermenschdwarves.