Define Sexual Selection?

http://www.biology-online.org/dictionary/Sexual_selection

Sexual selection is a concept in evolutionary biology that explains how certain traits or behaviors evolve in a population due to competition for mating opportunities. It is a form of natural selection that operates specifically on traits related to reproduction.

To understand sexual selection in more detail, we can break it down into two main mechanisms:

1. Intrasexual selection: This occurs when individuals of one sex (usually males) compete with each other for access to mates. These competitions can involve various forms, such as physical fights, displays of strength or aggression, or other behaviors aimed at outcompeting rivals. The winners of these competitions gain mating opportunities and the chance to pass on their genes to the next generation.

2. Intersexual selection: This occurs when individuals of one sex (usually females) choose their mates based on certain desirable traits or characteristics. These traits may indicate good genetic quality, health, or the ability to provide resources for offspring. Individuals with these preferred traits are more likely to be chosen as mates and have the opportunity to pass on their genes.

In both cases, sexual selection can lead to the evolution and persistence of certain traits that may not necessarily enhance survival but are advantageous in the context of reproduction. These traits can include elaborate physical features, attractive displays or behaviors, or even complex courtship rituals.

Understanding sexual selection helps us understand the diversity and complexity of traits and behaviors observed in many species. It also provides insights into mating strategies and the evolution of reproductive strategies.