The odds of a child being on the autistic spectrum can be influenced by various factors, including genetic and environmental factors. While autism spectrum disorder (ASD) has been found to have a genetic component, it is a complex condition with no single cause. Research suggests that both genetic and environmental factors interact to contribute to the development of ASD. If a paternal uncle has autism but there is no other known history of ASD in the family, the risk of autism for the child would generally be considered slightly higher than the general population. The exact increase in risk is difficult to quantify without more information, as the overall risk is influenced by many factors. It's important to note that having a relative with ASD does not guarantee that a child will develop the condition, nor does the absence of a family history guarantee that a child won't develop ASD. Genetic testing for autism is not currently available for diagnostic purposes, as there is no single gene or genetic marker that can definitively predict or diagnose ASD. However, research is ongoing to identify genetic variations associated with ASD and develop more accurate diagnostic tools. Currently, the diagnosis of autism is primarily based on behavioral observations and evaluations conducted by healthcare professionals, such as developmental pediatricians, psychologists, or psychiatrists. If you have concerns about child's development or suspect they may be showing signs of autism, it is important to consult with a qualified healthcare professional who specializes in child development. They will be able to evaluate the child's development and provide appropriate guidance and support based on their individual needs.