If the Concordance Rate for a Given Trait Is 10

Multiple Choice

If the concordance rate for a given trait is 10% for both identical and fraternal twins, this means that:

A) genes play a major role in the development of this trait, and the effect of environment in the appearance of this trait is negligible.
B) genes play a (relatively) minor role in the development of this trait, whereas environment plays a major role in the appearance of this trait.
C) genes and environment contribute equally to the development of this trait.
D) based on this data, you can make no statements regarding the role of either genes or environment in the manifestation of this trait.