Imagine that a human characteristic is determined by genotype only, with no environmental influence. Based on the amount of shared genetic information in MZ (monozygotic) and DZ (dizygotic) twins, what would you expect the concordance values to be in these two sets of twins?
A) The concordance values would be near 100% for both types of twins.
B) The concordance values would be near 50% for both types of twins.
C) The concordance values should be close to 100% for MZ twins and a concordance value much less for DZ twins.
D) The concordance values should be close to 50% for MZ twins and about 25% for DZ twins.
E) The concordance values should be close to 25% for MZ twins and about 75% for DZ twins.

Question

Quizplus · Accepted Answer

MZ twins share nearly 100% of their genetic information, so if a characteristic is determined solely by genotype, their concordance should be close to 100%. DZ twins share about 50% of their genetic information, so their concordance would be much less.

Imagine That a Human Characteristic Is Determined by Genotype Only