What is chase away selection?
Chase-away sexual selection posits that some male traits that attract females may actually be disadvantageous to the female, for example persuading her to mate with a frequency or at a time that is harmful to her (how?).
What is runaway selection in biology?
Runaway selection is a mechanism whereby a secondary sexual trait expressed in one sex becomes genetically correlated with a preference for the trait in the other sex. The genetic coupling of the trait and the preference leads to self-reinforcing loops of coevolution between the trait and preference for the trait.
What is Fisher’s runaway process?
Fisherian runaway or runaway selection is a sexual selection mechanism proposed by the mathematical biologist Ronald Fisher in the early 20th century, to account for the evolution of ostentatious male ornamentation by persistent, directional female choice.
What is runaway hypothesis?
runaway selection hypothesis, in biology, an explanation first proposed by English statistician R.A. Fisher in the 1930s to account for the rapid evolution of specific physical traits in male animals of certain species.
What are three ways that females may exhibit cryptic choice?
Mechanisms of cryptic female choice
- Pre-copulation.
- Insemination.
- Fertilization.
- Gestation.
- Post-birth.
What is good gene hypothesis?
good genes hypothesis, in biology, an explanation which suggests that the traits females choose when selecting a mate are honest indicators of the male’s ability to pass on genes that will increase the survival or reproductive success of her offspring.
Do animals mate for pleasure?
It is often assumed that animals do not have sex for pleasure, or alternatively that humans, pigs, bonobos (and perhaps dolphins and one or two more species of primates) are the only species that do. This is sometimes stated as “animals mate only for reproduction”.
What is female choice give an example?
Females can also sometimes exercise cryptic female choice by mating several times and selectively discarding sperm from certain males while retaining those from preferred males. In Drosophila flies and in field crickets, females mate multiply and select for sperm or spermatophores of certain males.
Do sperm compete?
In species where females mate with multiple males, the sperm of two or more males must compete to fertilise available ova [1]. Selection from sperm competition is expected to favor opposing adaptations that function either in the avoidance of or engagement in sperm competition [2], [3].