Equation 4 · Part 1 · The Peacock Problem: Darwin's Second Theory and Its Hard Tests

Symbol beta_p

\beta_p

\beta_p

What this part means

bet $a_p$ is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.

Its job in the formula

bet $a_p$ is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.

Full expressionSymbol beta_pArticle meaning

The passage around this formula

…[ 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 $\beta_t$ and $\beta_p$ for the direct selection gradients acting on each (natural selection pulling $\beta_t$ downward, since the ornament is costly), $h_t^2$ and $h_p^2$ for their heritabilities, and B for the genetic covariance that non-random mating builds between the two traits. The standard Lande-Fisher…

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Sources cited in the surrounding passage

[4] Models of speciation by sexual selection on polygenic traits ↗

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