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.

Question

Quizplus · Accepted Answer

When the concordance rate for a trait is the same for both identical and fraternal twins, it suggests that genetic factors play a relatively minor role in the development of this trait, and environmental factors are more significant. Identical twins share nearly all their genes, while fraternal twins share about 50% of their genes, on average. If the trait were strongly influenced by genetics, we would expect a higher concordance rate in identical twins compared to fraternal twins. The equal concordance rates indicate that the environment is a major factor in the development of this trait.

If the Concordance Rate for a Given Trait Is 10