What is the most likely cause of a disorder if both monozygotic and dizygotic twins show a high concordance rate?

The options are

A. Recessive genes

B. Dominant genes

C. Different environmental experiences

D. Shared environmental experiences

The answer is D. Shared environmental experiences

Explanation:

The most likely cause of a disorder if both monozygotic and dizygotic twins show a high concordance rate is shared environmental experiences.

This is because twins usually have a very high degree of concordance rate i.e they have similar genetic traits and characteristics as a result of factors such as Recessive and Dominant genes. The disorder or abnormality which would support this is them having shared environmental experiences which will make them have it in common unlike different environmental experiences which will aid variation.

some scientists like gregory adcock agree with thorne's theory of regional continuity.

others, like chris stringer and ian tattersall, believe thorne's results may be contaminated or misinterpreted.