Use the following to answer questions:
Refer to the graph below.

-On which basis do the data in the graph best support a high heritability for schizophrenia?
A) Dizygotic twins have a greater likelihood of being concordant for schizophrenia than monozygotic twins.
B) The likelihood of schizophrenia varies with the degree of genetic similarity to someone with the condition.
C) Monozygotic twins have a greater likelihood of being discordant for schizophrenia than other pairs of siblings.
D) The likelihood of schizophrenia varies with the degree of environmental similarity to someone with the condition.

Question

Use the following to answer questions:
Refer to the graph below.
 
-On which basis do the data in the graph best support a high heritability for schizophrenia?
A) Dizygotic twins have a greater likelihood of being concordant for schizophrenia than monozygotic twins. 
B) The likelihood of schizophrenia varies with the degree of genetic similarity to someone with the condition. 
C) Monozygotic twins have a greater likelihood of being discordant for schizophrenia than other pairs of siblings. 
D) The likelihood of schizophrenia varies with the degree of environmental similarity to someone with the condition.

Quizplus · Accepted Answer

The data in the graph show that as genetic similarity increases, the likelihood of schizophrenia also increases, supporting a high heritability for the condition. Specifically, the highest likelihood of schizophrenia is seen in individuals with a parent or sibling with the condition, who share 50% of their genes on average. This suggests that genetic factors play a significant role in the development of schizophrenia. The fact that monozygotic twins are more likely to both have schizophrenia than dizygotic twins, as shown in the graph, also supports a genetic component to the disorder. However, this does not necessarily indicate a high heritability, as other factors may play a role in the development of the condition as well.

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