outline and evaluate genetic factors in aggression

Good Essays
Outline and evaluate genetic factors in aggression

The use of twin studies helps explain how there could be genetic factors in aggressive behavior. There are two types of Twin, monozygotic (identical) and Dizygotic (non-identical). If both types are studied in terms of aggression and the M-Z twins are more similar in aggressive behaviour it would suggest there is a genetic influence on aggression. Coccaro et al found that when comparing MZ and DZ twins, over 50 % of variance in aggressive behaviours between MZ twins could be attributed to genetic factors.

Additionally the use of adoption studies can contribute to our understanding of genetic factors in aggression. If a positive correlation can be seen between adopted children and their biological parents ( where no environmental influenced has occurred) in aggressive behaviour then it would suggest a genetic influence. However if a positive correlation is found between adopted children and their foster parents, it shows there must be an environmental effect , a study of 14000 adoptions in Denmark show that a significant number of boys with criminal convictions had biological parents with criminal convictions. This provides evidence for the influence genetic factors has in aggression.

A gene called MAOA is associated with aggressive behaviour, it regulated the metabolism of serotonin, and additionally low levels of serotonin are associated with aggressive and impulsive behaviour. A study from a Dutch family with a history of violence including rape and arson found low levels of MAOA in their blood. It showed that the men had a defect in their MAOA. This study shows that the gene MAOA is associated with aggression, this means that some genes can influence the susceptibility to aggressive behaviour, however it is not certain that one gene can determine aggressive behaviour, however it is likely that many genes can contribute to human behaviour rather than one single gene.

A more integrated explanation is

You May Also Find These Documents Helpful

  • Good Essays

    The biological approach to aggression includes the belief that genetic factors play a role in aggressive behaviour and lies within an individual’s genetic make-up. There is supporting evidence of a genetic component of aggression. Psychologists have looked at twin studies to try and find evidence for a genetic basis o compare the degree of similarity of aggression between sets of monozygotic (MZ) twins and dizygotic (DZ) twins. In general it was found that aggressive behaviour is more highly correlated…

    • 1132 Words
    • 5 Pages
    Good Essays
  • Good Essays

    Genetic aggression

    • 677 Words
    • 2 Pages

    Aggression Discuss genetic factors involved in aggressive behaviour. The gene MAOA may be associated with aggressive behaviour. It is responsbile for breaking down neurotransmitters such as noradrenaline and dopamine after they have transmitted an impulse from one cell to another. The lower the MAOA gene,means that the more aggressive the behaviour as dopamine and noradrealine is accumulated in their bodies. There has been emperical support by CASES et al who investigated mice genetically engineered…

    • 677 Words
    • 2 Pages
    Good Essays
  • Good Essays

    Outline and evaluate biological explanations for aggression (24) The biological explanation for aggression states that aggression is innate behavior in people and the environment around them does not cause it. Neurotransmitters in the brain, chemicals that allow impulses to be transmitted from one area to another, can be used to explain why some people are aggressive. There is evidence to suggest that the neurotransmitters serotonin and dopamine are linked to aggression, low levels of serotonin…

    • 911 Words
    • 3 Pages
    Good Essays
  • Good Essays

    Outline and evaluate The SLT theory of aggression. Aggression is defined by Baron & Richardson (1993) as ‘any form of behaviour directed towards the goal of harming or injuring another living being who is motivated to avoid such treatment’. According to Social Learning Theory aggressive behaviour is developed through the environment (rather than being an innate tendency – as the biological and psychoanalytical theories would suggest). If biological theories of aggression were faultless it…

    • 627 Words
    • 2 Pages
    Good Essays
  • Good Essays

    Discuss genetic explanations for aggression. Early research concentrated on chromosomal abnormalities but no specific genotype has been associated with aggression. Genes determine how much testosterone a person’s body produces and how quickly it circulates around their body. Genes also determine the synthesis of testosterone receptors, and how many and how sensitive such receptors are. The gene called monoamine oxidase A (MAOA) produces an enzyme which regulates the metabolism of serotonin in…

    • 509 Words
    • 3 Pages
    Good Essays
  • Good Essays

    Outline and evaluate the social learning theory as an explanation of aggression (24) According to the social learning theory there are multiple ways of learning behaviours, such as aggression. One way of learning behaviours is through observation and some psychologists have claimed children primarily learn aggressive behaviours observing role models (someone who is similar to the child or in a position of power, of who the child can copy behaviour from). For example, children may learn aggression…

    • 1361 Words
    • 4 Pages
    Good Essays
  • Better Essays

    Outline and evaluate two social psychological explanations There are two social psychological approaches to aggression. These are social learning theory (SLT) and deindividuation theory (DT). Both these theories stress that aggression is a learnt process, they believe that aggression is due to our nurture and not in our nature. They dispute the biological approach to aggression. Social learning theory was proposed by Alburt Bandura. He used the word modeling to explain how humans can quickly learn…

    • 1198 Words
    • 5 Pages
    Better Essays
  • Satisfactory Essays

    Outline and evaluate research into institutional aggression deindividuation include being in a large crowd, anonymity due to wearing a uniform and altered consciousness due to drugs or alcohol. Deindividuation leads to reduced inner restraints and therefore an increase in behaviours that are usually inhibited and also reduces the fear of negative evaluation from others. This leads to an increase in aggressive behaviours. Recent changes to this theory focus on the importance of private self-awareness…

    • 415 Words
    • 2 Pages
    Satisfactory Essays
  • Good Essays

    Outline and evaluate one or more social psychological theories of aggression (8+16 marks) One social psychological theory of aggression is Bandura’s social learning theory, in which he combines both social and cognitive psychology in his social cognitive perspective of human behaviour. Bandura believed that behaviour was not only motivated by psychological factors but also by more socio-environmental factors. He argued that the individual and the environment were linked, something which he called…

    • 731 Words
    • 2 Pages
    Good Essays
  • Satisfactory Essays

    Outline and evaluate one social psychological theory of aggression (24) One social-psychological theory of aggression is Bandura’s Social Learning Theory (SLT), which suggests that people learn behaviour by not only direct reinforcement and punishment but also by observing the behaviour of others. If a person observes aggressive behaviour from a model figure, they may imitate this behaviour, especially if they identify or look up to the model. This does not necessarily mean that the aggressive behaviour…

    • 558 Words
    • 2 Pages
    Satisfactory Essays