Hamilton-Zuk hypothesis of sexual selection

The Hamilton-Zuk hypothesis, proposed by W.D. Hamilton and Marlene Zuk, suggests that female mate choice is driven by the desire for "good genes" that will enhance offspring survival and reproductive success. This means that traits preferred by females are honest indicators of a male's genetic quality.1

For example, bright coloration in male animals, such as in house finches, can signal good health and genetic robustness. While these striking traits might make males more vulnerable to predators (acting against natural selection), a male that displays them and thrives indicates he is a suitable mate. This concept falls under sexual selection, where reproductive advantage, rather than environmental adaptation, drives evolutionary processes.2