Question

Kayla and Layla are twins who were separated at birth. A researcher interested in studying heredity tracks them down and speaks to their different families about the benefits that can be achieved by studying the two young girls. The girls and their different sets of parents agree to participate, and studies begin assessing various areas of the girls' lives. In order for this type of twin study to be most effective, what kind of twins should Kayla and Layla be?

Answer 1

Monozygotic

Step-by-step explanation:

In order to study the effects of the environment a person's personality it is beneficial that the participants in a twin study be identical i.e., monozygotic. They develop from a single zygote.

They have almost hundred percent of their DNA the same. This rules out the role genetics have plays and only thing that needs to be focused is the environmental factors.

If there are personality traits that differ in Kayla and Layla it is purely due to environmental factors as they have almost identical DNA.