2nd October 2019

nature
15

What is an environmental influence?

The expression of genes in an organism can be influenced by the environment, including the external world in which the organism is located or develops, as well as the organism's internal world, which includes such factors as its hormones and metabolism.

What environmental factors can cause autism?

Scientists use the term "environmental" to refer to influences other than changes in a gene's DNA. Autism risk factors, for example, appear to include such influences as parental age at conception, maternal nutrition, infection during pregnancy and prematurity.
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