In general terms, the sexes within a species may be either competitive (i.e. compete against intrasexually for access to a resource, which is in this case, the opposite sex) or choosy. The ‘choosy’ sex therefore makes a decision about which member of the opposite sex he or she will mate with.
Intersexual selection (in contrast to intrasexual selection), is often known as female choice and is the process where the female choses the male based on certain ornaments e.g. a peacock’s tail. The ornament is not usually beneficial to the male (e.g. bright colours make it an attractive target for predators) but the female prefers the larger ornaments as it signals the male’s is able to cope with the hindrance.
Introduction
Some organisms tend to exhibit strategies that favour the reproductive success of their relatives, even at a cost to their own survival and/or reproduction. The classic example is a eusocial (highly social) insect colony, with sterile females acting as workers to assist their mother in the production of additional offspring. Many evolutionary biologists explain [...]
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