Assume that the concordance value for a particular trait is 85% for both monozyg

Question

Assume that the concordance value for a particular trait is 85% for both monozygotic twins. What can you conclude about this trait?

a) It is caused by environmental factors in dizygotic twins but by genetic factors in monozygotic twins.

b) It is likely caused almost exclusively by environmental factors.

c) It is caused by genetic factors in dizygotic twins but by environmental factors in monozygotic twins.

d) It is caused by both genetic factors and environmental factors.

e) It is likely caused almost exclusively by genetic factors.

Explanation / Answer

Answer:

In monozygotic twins, the DNA sequence or genome is fully identical. Thus, genetics do not play a role.

It's the environmental factors that lead to differential expression of genes and thus a value of 85% concordance .

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