Autism spectrum disorders are neurodevelopmental disorders that appear to be ________.
A) caused by a single dominant gene
B) multifactorial and complex in nature with a genetic component
C) caused by several genes located on the X chromosome
D) caused by a low number of recessive genes located mainly on the autosomes
E) directly related to trinucleotide repeat increases but not decreases

Question

Quizplus · Accepted Answer

Autism spectrum disorders are believed to be multifactorial and complex in nature with a strong genetic component. Although there may be specific genes that contribute to the development of autism, it is not caused by a single dominant gene or a low number of recessive genes. While there may be genes located on the X chromosome that contribute to the risk of autism, it is not solely caused by this. Trinucleotide repeat increases have been linked to some types of genetic disorders, but there is no direct evidence suggesting a relationship between these repeat increases and autism.

Autism Spectrum Disorders Are Neurodevelopmental Disorders That Appear to Be