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Genetics play a significant role in the development of autism spectrum disorder. Evidence from twin studies highlights this, showing concordance rates of 60-90% for identical twins, compared to just 5-10% for fraternal twins and siblings. Research has implicated numerous genes and mutations, particularly those involved in creating synaptic circuits that enable communication between different brain regions.

Genetic Influences on Autism Spectrum Disorder

A researcher observes that when one identical twin is diagnosed with autism spectrum disorder (ASD), the co-twin has a 60-90% chance of also being diagnosed. However, when a fraternal twin is diagnosed, the co-twin's chance is only 5-10%. Based on these findings, what is the most accurate conclusion about the development of ASD?

Research has found that when one identical twin is diagnosed with autism spectrum disorder (ASD), the other twin has a 60-90% chance of also being diagnosed. In contrast, when one fraternal twin is diagnosed, the other twin's chance is only 5-10%. Based on this information, what is the most accurate conclusion one can draw?

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