In a study of twins, a researcher finds that 40 percent of dizygotic (DZ) twins and 40 percent of monozygotic (MZ) twins share a trait. What is the researcher most likely to conclude about the trait?
a. It is 40 percent concordant.
b. It is 60 percent concordant.
c. It is genetically determined.
d. It is not genetically determined.
Question 2
What is the most likely cause of a disorder if both monozygotic and dizygotic twins show a high concordance rate?
a. recessive genes
b. dominant genes
c. different environmental experiences
d. shared environmental experiences
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