What is a recessive donor

If the condition is autosomal recessive, that means that two copies of an abnormal gene must be present in order for the disease to develop. So both the egg donor and sperm donor must pass on a mutation for the child to have the condition.

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poor water quality affects most estuarine organisms, including commercially important fish and shellfish. the pollutants that have the greatest impact on the health of estuaries include toxic substances like chemicals and heavy metals, nutrient pollution (or eutrophication), and pathogens such as bacteria or viruses.