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• Intelligence depends on environmental factors, not genetic

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lomus hona

on 21 April 2014

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Transcript of • Intelligence depends on environmental factors, not genetic

Interaction of Genetics and Environment
• Intelligence depends on environmental factors, not genetic factors.
the genetic basis of intelligence
Environment and intelligence
genetics and intelligence
today i am going to talk about genetics and intelligence
intelligence is a very difficult concept to define. Intellect is described as “the power of the mind to think in a logical manner and acquire knowledge. Even psychology experts have not agreed upon what this actually means . Intelligence can be divided into various subcategories such as reasoning, problem solving, and memory, and so creating a consistent scale by which one can measure intelligence is quite difficult.

The natural genetic make-up of the body interacts with the environment from the moment of conception. While extreme genetic or environmental conditions can predominate behavior in some rare cases, such as the inability of a mute person to speak regardless of their environment, these two factors generally work together to produce a person's intelligence level. They are so intertwined that it remains difficult to determine which influence holds the supreme position in shaping intelligence .
Genetics of Intelligence
Intelligence is of primary interest to human genetic research. The first methodical set of experimental observations can be traced back to Galton’s work in 1865, a year before Mendel’s influential article on the laws of heredity [5]. Galton evaluated the transmission of several traits in families using statistical tools. He concluded that many traits including mental ability are genetically transmitted and normally distributed in the general population. He did not analyze the role of the common environment within the families, biasing his conclusions towards the genetic. He did, however, recognize significant general principles such as regression to the mean in children of parents with extreme phenotypic traits.
Environment and intelligence research investigates the impact of environment on intelligence. This is one of the most important factors in understanding human group differences in IQ test scores and other measures of cognitive ability. It is estimated that genes contribute about 20-40% of the variance in intelligence in childhood and about 60% in old age. Thus the environment and its interaction with genes account for the remaining approximate 50% of intelligence. Historically, there has been great interest in the field of intelligence research to determine environmental influences on the development of cognitive functioning, in particular, fluid intelligence, as defined by its stabilization at 16 years of age. Despite the fact that intelligence stabilizes in early adulthood it is thought that genetic factors come to play more of a role in our intelligence during middle and old age and that the importance of the environment dissipates.
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