Genetic variation sexual traits

The aim of this chapter is to review genetic variation underlying exaggerated sexual traits. At first sight this has nothing to do with the nature of intelligence. However, there is one question in intelligence research that data and theory on... 

Before addressing these arguments about how selection alters the level of additive genetic variation, it is instructive to examine the data. A recent literature search was carried out of studies that measured the heritability of sexual traits (Pomiankowski Moller 1995). A comparison was made of the additive genetic variation in sexual and similar non-sexual traits from the same species. Ideally the same trait from the female (or the non-sexually selected sex) was used for comparison. When this was not available, another non-sexually dimorphic trait was used. 

Given that Gt<, the genetic variation in the rule for converting condition into sexual trait size, is likely to be small,... 

So if condition-dependence is strong (i.e., / >0), genetic variation in the sexual trait will largely depend on genetic variation in condition, as for most traits... 

---