Trivers-Willard Hypothesis
Investment in offspring based on parental status
The Trivers-Willard hypothesis proposes that parents in good condition will invest more in sons, while parents in poor condition will invest more in daughters. This hypothesis is based on the idea that sons have a higher potential for reproductive success, while daughters have a higher potential for survival and reproductive success in poor conditions.
- Parents in good condition will invest more in sons.
- Parents in poor condition will invest more in daughters.
- Sons have a higher potential for reproductive success.
- Assess parental conditionDetermine the condition of the parents, including their health, social status, and access to resources.Pro tipConsider multiple factors when assessing parental condition.WarningBe aware of potential biases in assessing parental condition.
- Determine offspring sexDetermine the sex of the offspring, as this will influence parental investment.Pro tipConsider the potential for sex-biased investment.WarningBe aware of potential biases in determining offspring sex.
- Adjust parental investmentAdjust parental investment based on parental condition and offspring sex.Pro tipConsider the potential for flexible investment strategies.WarningBe aware of potential biases in adjusting parental investment.
High-status parents may invest more in their sons, as sons have a higher potential for reproductive success.
Low-status parents may invest more in their daughters, as daughters have a higher potential for survival and reproductive success in poor conditions.
The Trivers-Willard hypothesis was first proposed by Robert Trivers and Dan Willard in 1973. They suggested that parents would adjust their investment in offspring based on their own condition and the condition of their mate.