Apart from sex specific natural selection and sexual selection that includes both intersexual and intrasexual selection, a third phenomenon also explains the differences in gene expressions between two sexes sexual antagonism.
32.
A male that is an orange color morph is seen as a more dominant male than any other morph in intrasexual competition, since the orange color displays the lizard as more aggressive.
33.
Since fertilization chances for an individual male are proportional to the amount of sperm simultaneously transferred into a female, the size of the testes and resulting production of sperm increases in situations with high intrasexual competition.
34.
However, some groups of species acquire a mate by the means of competitively engaging in an aggressive confrontation among others, whereby the victor is entitled to its significant other, a concept coined as intrasexual selection.
35.
Many types of avian sexual selection have been identified; intersexual selection, also known as female choice; and intrasexual competition, where individuals of the more abundant sex compete with each other for the privilege to mate.
36.
"' Sexual selection "'is a mode of natural selection where members of one biological sex mate with ( intersexual selection ), and compete with members of the same sex for access to members of the opposite sex ( intrasexual selection ).
37.
Research by Gangestad et al . ( 2004 ) indicates that highly fertile women prefer men who display social presence and intrasexual competition; these traits may act as cues that would help women predict which men may have, or would be able to acquire, resources.
38.
Stripped of its political trappings and illusions and cast in terms more typical of descriptions of animal behavior, what the theory says is that war is " a form of intrasexual male competition among groups, occasionally to obtain mates but more often to acquire the resources necessary to attract and retain mates, " according to two Canadian psychologists who advanced this theory at a meeting in Boston recently.
39.
In previous years, students at La Suerte have chosen to study a wide range of topics such as positional and feeding behavior of capuchin monkeys, plant diversity between artificial and natural forest gaps, inter-and intrasexual territoriality in northern jacanas, effects of ultraviolet radiation on leaf-breeding frog eggs, activity patterns and diet in giant bala ants, and attitudes in the local community toward conservation.
40.
This also explains why those women who have had children from a previous relationship are at higher risk of spousal homicide compared with those who have only had children with their current partner The female partner has already devoted her reproductive resources to another man, therefore when she establishes a new relationship, the male becomes involved in the upbringing of another man's offspring which will damage his hierarchical status amongst intrasexual rivals.
