Sexual selection, Biology

In this section you will be introduced to a variant of Darwinian concept of natural selection which he termed sexual selection. You may have observed very distinct and striking differences in appearance between opposite sexes of various animals groups, more prominently in birds and mammals. When differences in appearance occur between sexes, the animals are said to exhibit sexual dimorphism, the phrase simply meaning that themales and females are not uniform in appearance, but present two different forms. In general the males of the species are strikingly  different from females although there may be exceptions to this rule. The male of the species may be more aggressive, brilliantly coloured or possess elaborate combs or bright plumage or extensive horns or ornamental hooks, tusks, spurs etc. Why are the male members different from the females? Is it not that the possession of such extra structures easily identify them to the enemies and make them more susceptible to their attack? Can these characters therefore be regarded as disadvantageous or ill-adaptations? If that be the case, is not the theory of natural selection contradicted?

As an answer to these questions, Darwin proposed the theory of sexual selection. According to the theory, the females of the species select their males and therefore a male which is more attractive or stronger than the other members of its sex has better chances of mating and leaving behind its offspring. In males there'will be a constant evolution of such characters which are attractive to their female counterparts. Sexual selection can be regarded as competition among the members belonging to a sex to win the members of. the opposite sex.

Posted Date: 4/6/2013 12:46:27 AM | Location : United States







Related Discussions:- Sexual selection, Assignment Help, Ask Question on Sexual selection, Get Answer, Expert's Help, Sexual selection Discussions

Write discussion on Sexual selection
Your posts are moderated
Related Questions
Age Distribution - Population Parameters and Regulation It is obvious that individuals in a population will be of different age groups. Relative numbers of young and old indiv

Intravenous Route This route of administering drugs is becoming more popular in the paediatric practice. Purpose of this Route When rapid action is required.

Determine the significance of Siphuncle. A cord of tissue that passes between different chambers of a Nautilid shell. Siphuncle regulates the amount of air or fluid in chambers

How do antibody-based tests detect how HIV infection works? After the infection by the HIV the immune system starts the production of antibodies (primary immune response) again

Moss Stage - Xerarch The accumulation of soil, particularly in the crevices and depressions of rock favours the growth of certain xerophytic mosses, e.g., species of Polytrich

Main Components of Blood Plasma You would recall the various types of cells found in blood. The composition of human blood plasma is given in Table. The very structure of bloo


Q. Explain scombroid poisoning? Ingestion of improperly handled and stored seafood (yellow-fin tuna, skipjack, bonit and mackerel) causes scombroid poisoning. Maitoxin has been


Nutrition, Feeding, Digestion All organisms require a fairly steady supply of nutrient materials from the environment to obtain energy in order to stay alive. The animals are