TABLE 6.2 Concordance of monozygotic and dizygotic twins for several traits Concordance (%) Trait Monozygotic Dizygotic 1. Heart attack (males) 39 26 2. Heart attack (females) 44 14 3. Bronchial asthma 47 24 4. Cancer (all sites) 12 15 5. Epilepsy 59 19 6. Death from acute infection 7.9 8.8 7. Rheumatoid arthritis 32 6 8. Multiple sclerosis 28

Human Heredity: Principles and Issues (MindTap Course List)
11th Edition
ISBN:9781305251052
Author:Michael Cummings
Publisher:Michael Cummings
Chapter5: The Inheritance Of Complex Traits
Section: Chapter Questions
Problem 17QP: Monozygotic (MZ) twins have a concordance value of 44% for a specific trait, whereas dizygotic twins...
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On the basis of the concordances shown in Table  is variation in rheumatoid arthritis influenced by genetic factors, environmental factors, or both? Explain your reasoning.

TABLE 6.2 Concordance of monozygotic and dizygotic twins
for several traits
Concordance (%)
Trait
Monozygotic
Dizygotic
1. Heart attack (males)
39
26
2. Heart attack (females)
44
14
3. Bronchial asthma
47
24
4. Cancer (all sites)
12
15
5. Epilepsy
59
19
6. Death from acute infection
7.9
8.8
7. Rheumatoid arthritis
32
6
8. Multiple sclerosis
28
Transcribed Image Text:TABLE 6.2 Concordance of monozygotic and dizygotic twins for several traits Concordance (%) Trait Monozygotic Dizygotic 1. Heart attack (males) 39 26 2. Heart attack (females) 44 14 3. Bronchial asthma 47 24 4. Cancer (all sites) 12 15 5. Epilepsy 59 19 6. Death from acute infection 7.9 8.8 7. Rheumatoid arthritis 32 6 8. Multiple sclerosis 28
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