$$\begin{aligned} \Delta \bar{t} &= h_t^{2}\,\beta_t + B\,\beta_p \\ \Delta \bar{p} &= B\,\beta_t + h_p^{2}\,\beta_p \end{aligned}$$

Equation 9 · Evolutionary Biology

The Peacock Problem: Darwin's Second Theory and Its Hard Tests

This equation states an equality: the expressions on both sides have the same value under the article’s assumptions.

Russell Lande’s 1981 paper gave this verbal logic its standard quantitative-genetic form, modelling the joint evolution of a female preference trait and a male display trait under stabilising natural selection on the display and showed that, “despite stabilizing natural selection on males, various types of mating preferences may create a runaway process in which the outcome of phenotypic evolution depends critically on the genetic variation parameters and initial conditions of a population” [ 4 ] . One compact way to see why sits in the coupling itself. Let $\bar t$ be the population mean of a male display trait and $\bar p$ the population mean of the corresponding female preference; write…

Meanings in this article

• $\beta_t$: the write.
• $B$: the when.

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