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Sexual Selection Quiz

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Questions and Answers

What unique character defines the two biological sexes for animals?

Males have smaller gametes (sperm versus eggs) (correct)

Males have a penis; females don’t

Males have bigger bodies (on average)

Males have both X and Y sex chromosomes, whereas females have 2 X sex chromosomes

What form can sexual selection take?

Intersexual selection — individuals of one sex prefer certain attributes of individuals of the other sex (correct)

Intrasexual selection — individuals of one sex prefer certain attributes of individuals of the other sex

Random selection — individuals select mates without preference

Mutual selection — both sexes prefer certain attributes of each other

What is typically female choice in sexual selection?

Choosing mates based on physical size

Choosing mates based on certain attributes (correct)

Choosing mates based on genetic similarity

Choosing mates based on resources provided

What did Charles Darwin find difficult to explain with his theory of natural selection?

The absurdity and beauty of peacock plumage Signup and view all the answers

What do males and females have in terms of gametes?

Males have larger gametes than females Signup and view all the answers

What defines the two biological sexes for animals?

Males have smaller gametes (sperm versus eggs) Signup and view all the answers

What is typically female choice in sexual selection?

Preferring certain attributes in individuals of the other sex Signup and view all the answers

Why did Charles Darwin find it difficult to explain something beautiful and absurd?

Due to the direct and indirect benefits choosy females seek in a mate Signup and view all the answers

What form can sexual selection take?

Intersexual selection - individuals of one sex prefer certain attributes in individuals of the other sex Signup and view all the answers

What unique character defines the two biological sexes for animals?

Males have smaller gametes (sperm versus eggs) Signup and view all the answers

Study Notes

Biological Sexes in Animals

The unique character that defines the two biological sexes for animals is the type of gametes they produce: males produce small, mobile gametes (sperm) and females produce large, immobile gametes (eggs).

Sexual Selection

Sexual selection can take the form of competition between members of the same sex (intrasexual selection) or choice by one sex of a mate (intersexual selection).
Typically, female choice is observed in sexual selection, where females choose their mates based on certain characteristics.

Natural Selection and Charles Darwin

Charles Darwin found it difficult to explain the evolution of elaborate and ornate traits in males, such as bright plumage or complex songs, using his theory of natural selection.
He struggled to understand why these traits, which seemed to be a hindrance to survival, had evolved and been maintained in populations.

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Description

Test your understanding of sexual selection with this quiz. Explore the concept of differential mating success and the roles of males and females in the process. Discover how sexual selection influences mating behavior and the factors that lead to sex-role-reversed species.