You are probably aware that fish is considered "brain food" that can affect the cognitive function. But we're not sure how nutrition and genetics interact with each other.
I have read a paper and studies claim that genes influence the way fatty acids are synthesized by a pregnant mother. These scientists have checked the variations in the fatty acid desaturase gene cluster, which is directly related in DHA synthesis from omega 3 fatty acids. The group considers taking blood samples from pregnant women who are 20 weeks and from the umbilical cord at birth. They've analyzed for the omega-3 and omega-6 fatty acids. After conducting the study, they've found out that both the mother and the child affects the composition of fatty acids in cord blood. "Both the mother's genotype and baby's genotype equally affected levels of DHA",as they concluded.