This sub heading is well explanatory and provides proper information about the disorder. Such kind of simple writing in scientific articles is not easily seen, but this sub heading is very simple and easy to understand. Also, the use of words makes the understanding towards paragraphs, easy and convenient. The scientific writing requires attention towards the subject and proper organization of the words. The main topic sentence in these two paragraphs is “Autism spectrum disorders (ASD) is a generic term representing a group of neuro developmental disorders which are primarily detected during childhood and characterized by qualitative impairment in communication, aberrant social interaction, and restrictive patterns of behaviors”. The remaining part of the paragraph explains the genetic and environmental factors responsible for the disorder in children. The topic sentence in the second paragraph is comparatively small than the average sentence length in the article. The sentence is “Genetic predisposition and environmental factors have been associated with the aetiology of ASD”. The sub heading is divided into four paragraphs.
The sub heading here explains that the genes which are responsible for autism spectrum disorder are still unknown. The genetic predisposition is mainly considered as the aetiology of ASD. Genetic syndrome is the several disorders associated with the condition of autism. Thus, the genetic abnormalities, this paragraph also explains that environmental factors are mainly responsible. The paragraphs have been explained with simple sentences and proper use of scientific words. Such kind of writing requires precision and scientific language. The authors of the article have explained everything in simple words, so that readers could easily read and understand. The topic sentence in the first paragraph of the sub heading is “Although genes responsible for the majority of forms of autism are mostly unknown, it is generally agreed that a genetic predisposition is relevant to the aetiology of ASD because numerous polymorphisms, in addition to other genetic aberrancies, have frequently been reported”. The average length of the sentences is 3-4 lines and the number of words is 38-40 words.