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Parental Investment Theory in Evolutionary Biology

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Parental Investment Theory in Evolutionary Biology

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Questions and Answers

What is the primary focus of parental investment theory?

Exploring the differences in reproductive success between males and females

Studying the asymmetry in gamete size between males and females

Understanding the evolution of reproductive behaviors and strategies (correct)

Investigating the optimal reproductive strategy in a particular environment

Which sex is predicted to be more selective in choosing mates according to parental investment theory?

The sex with the larger gamete size

The sex with the lower parental investment

The sex with the higher parental investment (correct)

Both sexes are equally selective

What is the trade-off that parents face in parental investment theory?

Reproductive success vs. survival rate

Mate choice vs. resource allocation

Quality vs. quantity of offspring (correct)

Time vs. energy investment in offspring

What is the relationship between parental investment and mate choice?

Individuals choose mates based on traits that indicate high-quality genes or resources for offspring Signup and view all the answers

What is the primary reason for the asymmetry in parental investment between males and females?

Differences in gamete size and physiological costs associated with reproduction Signup and view all the answers

Who developed the concept of parental investment theory?

Robert Trivers Signup and view all the answers

Study Notes

Parental Investment Theory

Developed by Robert Trivers in 1972 as an evolutionary biology concept to explore differences in parental investment in offspring between males and females.

Key Principles

Asymmetry in investment exists due to differences in gamete size and physiological costs associated with reproduction between males and females.

Reproductive Strategies

The sex with higher parental investment (often females) is more selective in choosing mates.
The sex with lower investment (often males) competes more intensely for access to mates.

Offspring Quality vs. Quantity

Parents face a trade-off between investing heavily in a few offspring (quality) or producing many offspring with lower investment per offspring (quantity).
The optimal strategy depends on environmental and ecological factors.

Mate Choice

Individuals choose mates based on traits indicating high-quality genes or resources for offspring.
This is influenced by the unequal investment of time, energy, and resources between male and female parents.

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Description

Learn about Robert Trivers' 1972 concept that explores the differences in parental investment in offspring, influencing reproductive success. Key points include asymmetry in investment and more.