Suppose that a geneticist studies a series of characteristics in monozygotic twins and dizygotic twins. He finds various rates ofphenotypic concordance for the characteristics, as shown in the table.Rate of phenotypic concordance (%)CharacteristicMonozygoticDizygoticmigraine headache6030eye color10040measles9090clubfoot3010high blood pressure7040handedness7070tuberculosisClassify each characteristic according to whether the corresponding rates of concordance indicate a genetic influence, anenvironmental influence, or both genetic and environmental influences. Genetic onlyEnvironmental onlyGenetic and environmentalAnswer Bankhandednesscye colormigraine headacheclubfoothigh blood pressuremeaslestuberculosis

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Suppose that a geneticist studies a series of characteristics in monozygotic twins and dizygotic twins. He finds various rates of phenotypic concordance for the characteristics, as shown in the table. Rate of phenotypic concordance (%) Characteristic Monozygotic Dizygotic migraine headache 60 30 eye color 100 40 measles 90 90 clubfoot 30 10 high blood pressure 70 40 handedness 70 70 tuberculosis 5 Classify each characteristic according to whether the corresponding rates of concordance indicate a genetic influence, an environmental influence, or both genetic and environmental influences.

Suppose that a geneticist studies a series of characteristics in monozygotic twins and dizygotic twins. He finds various rates of phenotypic concordance for the characteristics, as shown in the table. Rate of phenotypic concordance (%) Characteristic Monozygotic Dizygotic migraine headache 60 30 eye color 100 40 measles 90 90 clubfoot 30 10 high blood pressure 70 40 handedness 70 70 tuberculosis 5 Classify each characteristic according to whether the corresponding rates of concordance indicate a genetic influence, an environmental influence, or both genetic and environmental influences.

Human Heredity: Principles and Issues (MindTap Course List)

11th Edition

ISBN:9781305251052

Author:Michael Cummings

Publisher:Michael Cummings

Chapter18: Genetics Of Behavior

Section: Chapter Questions

Problem 14QP: A pedigree analysis was performed on the family of a man with schizophrenia. Based on the known...

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A geneticist studies a series of characteristics in pairs of monozygotic and dizygotic twins, obtaining the concordances listed below. For each characteristic, indicate whether these concordances suggest genetic influences, environmental influences, or both. Explain your reasoning. Concordance (%) Characteristic Monozygotic Dizygotic Migraine headaches 60 30 Eye color 100 40 Measles 90 90 Club foot 30 10 High blood pressure 70 40 Handedness 70 70 Tuberculosis 5 5
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