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Evolution and Genes -3

Evolutionary Psychology Evolutionary psychology uses evolutionary theory to explain similarities in psychological characteristics. According to evolutionary psychologists, patterns of behavior have evolved through natural selection, in the same way that physical characteristics have evolved. Because of natural selection, adaptive behaviors, or behaviors that increase reproductive success, are kept and passed on from one generation to the next.
Mating Behavior Because reproductive success is such a hot topic in evolutionary theory, evolutionary psychologists often choose to study mating behavior. Researchers such as Robert Trivers have proposed that mating strategies depend on the amount of parental investment made by males and females of a species. Parental investment refers to all the resources spent to produce and raise offspring. In many species, males and females don’t make equal parental investments. The sex that invests less competes with others of its sex to mate with the…

Evolution and Genes -2

Types of Genetic StudiesResearchers do different kinds of studies to see whether and to what extent a characteristic might be genetically transmitted.
Family Studies In family studies, researchers look at similarities among members of a family with respect to a particular trait. If the trait is genetically inherited, it should be similar in blood relatives. The closer the blood relationship, the more similar people should be.
Family studies alone don’t reveal whether a trait is genetically inherited. A family shares genes, but they also share similar environments. When researchers find trait similarity in a family study, their findings may suggest that the trait is genetically inherited, but the study can’t prove it.
Twin Studies Compared to family studies, twin studies give researchers more solid evidence about whether a trait is inherited. In twin studies, researchers compare pairs of identical twins to fraternal, or nonidentical, twins. When doing these studies, researchers …

Evolution and Genes -1

IntroductionWhich has the greater effect on human behavior: nature or nurture? Hair color, height, and many other physical characteristics depend on genes, or nature, but the origin of behavior, intelligence, and personality is not so clear. Most scientists agree that both genes and the environment play a role in behavioral development, but disputes still rage over the degree of influence exerted by each.
A branch of psychology known as behavior genetics examines the genetic base of behavioral and personality differences among people. Behavior genetics is a controversial field, since misuse of psychological research into the genetic roots of behavior can have horrifying results. Several generations ago, psychologists and other scientists used arguments about the genetic influence on behavior and intelligence to support racist theories about the superiority of Anglo Americans. Moreover, these theories often became the foundation of public policies that discriminated against A…

march 19,2009 News

Top Headline Last Updated: 8:10:35 AM March 19, 2010  US Intelligence Chief discusses terrorism with ChidambaramThe US Director of National Intelligence, Mr Dennis C. Blair and Ambassador Timothy Roamer today met the Home Minister, Mr P. Chidambaram hours before the the Lashkar e Taiba operative David Headley is to be produced before Chicago court.Later Mr Timothy Roamer said that meeting was the co...
India keeping close eye on Headley's pleadingIndia today said it is waiting for the statement of Mumbai terror suspect David Coleman Headley,who will be produced in a Chicago court, amid reports that he would change his plea to guilty to get a lighter sentence than the death penalty.E...
Pawar rules out export of surplus wheatThe government today said the prices of essential commodities are coming down in local markets. Speaking on the sidelines of a function in New Delhi, Union food and agriculture minister, Sharad Pawar ruled out any possibility of allowi…