HUMAN GENETICS
AND GENOMICS

Fourth Edition

Bruce R. Korf and Mira B. Irons

HUMAN GENETICS AND GENOMICS

Multiple Choice Questions

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Chapter 5: Question 1

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  1. A study of a disorder reveals that monozygotic twins are concordant 40% of the time, whereas full siblings are concordant 10% of the time. Which of the following is the best interpretation of this finding?

A The trait has no genetic component.
B The trait is completely determined by genetics.
C Genes contribute to the trait, but are not deterministic.
D The trait must be due to the biology of twinning.
E There must be an error in the determination of zygosity for some of the research subjects.