Topic 2.1- Twin Studies (genetic theories)

Question 1

Monozygotic

Answer 1

Identical twins, which share 100% of their DNA

Question 2

Dizygotic

Answer 2

Non identical twins, which share 50% of their DNA

Question 3

Concordance rate

Answer 3

The rate as to which the twins share a characteristic

Question 4

Why are twins used?

Answer 4

As twins were born and raised at the same time whilst also being the same age and therefore there isnt any bias or differences as to how they were raised.

Question 5

Concordance rate in monozygotic twins

Answer 5

52%

Question 6

Concordance rate in Dizygotic twins

Answer 6

22%

Question 7

Strengths of this theory

Answer 7

.Monozygotic twins are genetically identical, logical that their behaviour will also be identical
.higher concordance rate for identical than non identical twins

Question 8

Limitations of this theory

Answer 8

.If genes were the only cause of criminality then identical shows would show 100% concordance
.adoptive family is chosen due to similarity to birth family
.impossible to isolate and measure the effects of genes separately