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The children of couples in which one partner has blood type O (genotype ii) and the other partner has blood type AB (genotype IA^{A}IB^{B}) are studied.

a. What is the expected concordance rate for blood type of MZ twins in this study? Explain your answer.

b. What is the expected concordance rate for blood type of DZ twins in this study? Explain why this answer is different from the answer to part (a).

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Answered 11 months ago
Answered 11 months ago
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a. Concordance is the percentage at which the twins in the study have the same trait. Since identical twins have identical genotypes and the trait blood group is determined entirely by the genotype, concordance in MZ twins is 100%.

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