6. Which of the following factors increases the probability of a child's being diagnosed with autism spectrum disorder?
Answer: A
The child has a sibling with the disorder.
Having a sibling diagnosed with autism spectrum disorder significantly increases the likelihood of another child being diagnosed, as genetic and environmental factors play a crucial role in the development of the condition.
A) The child has a sibling with the disorder.
This option is correct because numerous studies have shown that children who have a sibling with autism are at a higher risk of being diagnosed with the disorder themselves. This familial connection suggests a genetic predisposition that contributes to the development of autism spectrum disorder.
B) The child was inoculated against childhood diseases.
This option is incorrect as there is no scientific evidence linking vaccinations to an increased risk of autism. In fact, extensive research has disproven any correlation between inoculations and the development of autism spectrum disorder.
C) The child has a mother who is in her twenties.
This option is also incorrect, as maternal age in the twenties is not a recognized risk factor for autism. Research indicates that older parental age, particularly paternal age, may be more closely associated with an increased risk of autism spectrum disorder.
D) The child has a parent who is unfriendly.
This option is incorrect because parental demeanor or personality traits such as being unfriendly do not have a scientifically established connection to the likelihood of a child developing autism spectrum disorder. Autism is primarily influenced by genetic and biological factors rather than social behaviors.
E) The child has introverted parents.
This option is incorrect as well. While parental behavior and environment can influence a child's development, there is no direct evidence suggesting that having introverted parents increases the risk of autism spectrum disorder. The disorder is more closely related to genetic factors than to personality traits.
Conclusion
The presence of a sibling with autism spectrum disorder is a significant risk factor for the diagnosis of the condition, highlighting the role of genetics in its development. In contrast, the other options lack empirical support and do not correlate with an increased probability of autism. Therefore, option A stands out as the only correct answer in this context.