Jacob’s XXY

• Human females have two x chromosomes (XX)
• human makes poses an XY pairing. Therefore, Y is considered to be the male chromosomes.
• XYY syndrome is a rare chromosal disorder that only affects males. It’s is caused by the presence of an extra Y chromosome.
• Individual with the syndrome have one X and two Y chromosomes.
• Chromosomes are thread -like structures located inside the nucleus of animals and plants. Our chromosomes contains our DNA.
• DNA is a persons blueprint and is passed down from parents to offsprings.
• What does DNA determine?

  it determines our physical and personality traits.
• What is the symptoms shown by having XXY chromosomes?

  increased testosterone.

  Most are very tall (180 or more) and have high BMI (overweight).

  severe acne during adolescence.

  intelligence is usually normal to lower range.

  immature and irresponsible.

  possibly have learning disabilities and behavioural problems.
• XYY genetic theory suggest that some crime might be attributable to a chromosomal abnormality.
• What does studies suggests?

  In 8 studies, it suggests violent offenders have higher testosterone levels than less violent prison inmates. This is shown by it being carried out by different types of violent offenders.
• Kreuz and Rose (1972) were the first to find that prisoners with a history of violent crime during adolescence showed higher testosterone than other prisoners.
• who is Richard Speck?

  He is serial who had killed 8 nurses in July 1966 in Chicago. He is seen as a representative of the XYY theory as he shown to have the symptoms such as being overly tall (6 foot 1), repeated 8th grade and dropped out of school before he turned 11 and his face was covered with acne scarring.
• What did Richard Speck do?

  He killed 8 nurses and systematically sexually assaulted and strangled each women individually. One nurse was able to get away because he had miscounted his victims and she hid under the bed and reported him.