Which of the following twins has the highest concordance rate for myopia?
a. monozygotic (MZ) twins in a developed nation
b. monozygotic (MZ) twins in a developing nation
c. dizygotic (DZ) twins in a developed nation
d. dizygotic (DZ) twins in a developing nation
A. Myopia being partly genetic and partly environmental, monozygotic twins in a developed nation are more likely to have a closer concordance rate. Myopia is a problem that is more likely to occur in developing countries than in developing countries, and in MZ twins more than DZ twins since it is also partly genetic.
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