• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

The Influence Of Genetics On Behavior

Extracts from this document...

Introduction

´╗┐Demetra Dokas Psychology IB1 29/10/2012 The Influence of Genetics on Behavior In this essay I will explain to what extent genetics influence behavior. Human genetic information is stored in chromosomes, which are tightly wound strings of DNA present in every cell of the body. There are 23 pairs of chromosomes in human cells and each chromosome pair consists of one chromosome from each parent. Genes are thought to be responsible for the development of physical and behavioral characteristics. But psychologists now know that there are also environmental triggers, such as upbringing, childhood, or poverty, which influence behavior. Such studies are Heston?s study of schizophrenia, Bouchard and Mcgue?s study of IQ correlations,the Minnesota Twin study, Jahoda?s study of the self fulfilling prophecy, and Hutching and Mednick?s study on crime and others. Schizophrenia is a mental disorder characterized by a breakdown of thought processes and by poor emotional responsiveness. It most commonly features auditory hallucinations, paranoid or bizarre delusions, or disorganized speech and thinking, and it is accompanied by significant social or occupational dysfunction. Heston(1966) conducted and adoption study and looked at the incidence of schizophrenia in children who lived in foster homes. ...read more.

Middle

They found that the closer the kinship, the higher the correlation for IQ. Another twin study that supports the statement that intelligence is genetic is the Minnesota Twin Study (Bouchard et al. 1990). In this study, MZA?s( identical twins raised apart) and MZT?s (identical twins raised together) were compared. Each twin completed around 50 hours of testing and interviews. Bouchard found that 70% of intelligence can be attributed to genetic inheritance. This study has many strengths and weaknesses. The strengths are that there were participants from all over the world and that the mean age of participants was 41 years old. The limitations were that Bouchard relied on media coverage to recruit participants, there were some ethical concerns about the way he reunited the twins, and there was no way to establish the frequency of previous contact between the twins. In contrast to these two studies, there are studies that show that environment has a greater influence on genetics. Scarr and Weinberg (1977) and Horn et al. (1979) studied parents who had raised both adoptive and natural children. ...read more.

Conclusion

This shows that the naming of children has resulted in a self fulfilling prophecy. Hutching and Mednick?s (1975) study of criminal behavior proved otherwise. They studied criminal activity in biological and adoptive fathers and their sons. They found that if both the adoptive and biological fathers had criminal records, 36.2% of sons also did; if only the biological father was criminally active, 21.4% of sons also had criminal records; and if only the adoptive father had a criminal record, it dropped to 11.5% of sons. When neither father was a criminal, 10.5% of sons were. This study shows the importance of genetics in combination with environmental factors in the development of criminal behavior. According to the studies mentioned above, both genetics and environmental factors influence behavior. Heston showed that schizophrenia is mostly genetic. Bouchard and McGue and the Minnesota Twin Study found that intelligence is genetic, but Scarr and Weinberg and Horn disproved them showing that intelligence is mostly learned. Jahoda found that criminal behavior is more influence by environment, but Hutching and Mednick found that criminality was more genetic with environmental factors. Today most psychologists agree that humans may be predisposed to a certain behavior, but without the right environmental stimulators, the behavior may not develop. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our International Baccalaureate Psychology section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related International Baccalaureate Psychology essays

  1. IB Psychology - To what extent does genetic inheritance influence our behaviour?

    How does genetics and behaviour play roles in defining our aggressive actions? Or does merely one of them do? The Capsi study in 2002 inquired to whether a gene defined as MAOA (commonly known as "The Warrior Gene" and an environment considered abusive concluded higher rates of behaviour that was anti-social.

  2. To what extent does genetic inheritance influence behavior

    However, it is important to note the other side of the spectrum as well in this long-standing argument. The value of environment and development through age is just as critical as their heredity. Although studies of twins' IQ support the argument: to large extent genetic inheritance influence, similar outcome is

  1. This essay will examine the various arguments that are brought up pro and against ...

    Singh in 1920. The girls were fond of raw meat and licked all liquids. They behaved like wolves, their tongues were always hanging out and they panted. They never slept after midnight and could move easily in the night.

  2. Psychology IB Abnormal Notes and Essay Plans

    Influences on us vary profoundly from person to person. Huge array of variables that can affect behavior. Treatment successes have helped professionals to build a clearer picture of factors that influence the development of these illnesses but etiologies are complex and multi-faceted. Professionals need to be flexible and open-minded and provide a range of treatments and therapies to help

  1. Psychology IB Abnormality Notes

    someone back to a state of mental health effectively and to use an eclectic approach. Evaluate psychological research relevant to the study of abnormal behavior Introduction 1. Different types of psychological research studies used to study abnormal behavior 1. When researchers are gathering the symptoms of a disorder, they look for 1.

  2. Where does Schizophrenia Lie in the Spectrum of Nature vs Nurture?

    About 1% of the population worldwide is diagnosed with schizophrenia, and 1.2% of Americans (3.2 million) have the disorder. Additionally, 1.5 million people are going to be diagnosed with schizophrenia this year around the world. In the United States, this means that approximately 100,000 people will be diagnosed, which means

  1. With reference to relevant research studies, to what extent does genetic inheritance influence ...

    This leads to the conclusion that the women with the most active disgust mechanisms, survived long enough to pass down their genes through generations and therefore kept this mechanism prevalent.

  2. With reference to relevant studies, to what extent does genetic inheritance influence behaviour?

    The results of this experiment suggest that the genetic inheritance has a stronger influence over behavior than environmental factors. To a lesser extent, there is evidence to suggest that environmental influences may affect human behaviour. This is supported by Scarr and Weignberg (1977)

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work