biological theories Flashcards

1
Q

what are the three genetic biological theories of crime?

A

jacobs XYY
twin studies
adoption studies

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2
Q

what is Jacobs XYY about?

A

chromosomal abnormality

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3
Q

how many new borns have XYY

A

1/1000

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4
Q

how many more likely is someone with XYY likely to be in prison population

A

10x more likely

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5
Q

why are men with an XYY chromosome more likely to be found in a prison population?

A

because the extra Y chromosome makes them more masculine , so they produce more testosterone

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6
Q

Jacob et al found what to support his theory

A

a link between aggression to violent behaviour

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7
Q

what is another strength of Jacobs XYY study?

A

we can see they are more represented in the prison population.

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8
Q
A
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8
Q

what did Jacobs XYY study not look at, which is a limitation

A

didn’t look at psychological , environmental and social factors

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9
Q

who found that XYY men were not linked to agression

A

Thielgaard

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10
Q

what did Theilgaard find that is a limitation of Jacob’s XYY study?

A

that XYY men were not linked to aggression

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11
Q

what year did Theilgaard discover there was no link

A

1984

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12
Q

what are the two types of twins in twin studies?

A

monozygotic that come from one egg and dizygotic which comes from two eggs

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13
Q

what is controlled in twin studies

A

the environment as they are equal

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14
Q

who tested on 30 same sex twins

A

lange

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15
Q

how many MZ twins were in langes study

16
Q

how many DZ were there in Lange’s study ?

17
Q

how many MZ twins were both criminal ?

18
Q

how many of the DZ twins were both criminal?

19
Q

what does the statistic of twin studies shown?

A

crime is genetic and it is hereditary