In sexual selection, the female of the species tends to choose mates based on a group traits they show that are more attractive.
In primates it's always males competing. .
Stags, rams, and bulls use antlers or horns in contests of strength; a winning male usually secures more female mates.
sexual dimorphism, the differences in appearance between males and females of the same species, such as in colour, shape, size, and structure, that are caused by the inheritance of one or the other sexual pattern in the genetic material. berkeley. Sexual selection can also come about because a trait—the antlers of a stag, for example—increases prowess in competition with members of the same sex.
For example, male damselflies scrub rival sperm out of the female reproductive tract when mating.
. . Most species, males compete for access to females, and females are the choosier sex.
Intrasexual selection, also called mate competition, involves one sex competing with members of the same sex for access to mates.
This is called sexual dimorphism. .
Sexual selection can also come about because a trait—the antlers of a stag, for example—increases prowess in competition with members of the same sex. Sexual selection can be thought of as two special kinds of natural selection, as described below.
The emphasis was on the survival (mortality selection), mating success (sexual selection), or family size (fecundity selection) of individuals.
One extreme example of this case would be selective abortion of zygotes in both plants [40,41] and animals ,.
Competition among males occurs whether species mate via internal or external fertilization. Males of many spiders , such as this Phidippus. Understanding sexual selection influences the way we view animal traits, behaviors, and mate choice, including humans 3.
And animals have evolved some doozies when it comes to sneaky mating behavior: Sly male crickets produce no chirp themselves, but poach females attracted to another cricket’s call. These fantastically elongated upper tail coverts are raised and fanned in displays to females. 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. . Stags,.
There are, however, species in which the sexes exhibit striking dimorphism (or physical difference). .