Community
Genetics Program

Recessive conditions

Recessive genetic conditions are a result of an individual having 2 faulty copies of a recessive condition-causing gene. This occurs when the individual inherits one faulty copy from their mother and one from their father. This person is affected by the genetic condition.

An individual with one faulty copy of a gene that causes a recessive condition is a carrier of the condition and has a 50:50 chance of passing the fault onto their child. Carriers are not affected physically in any way.

  • Genetic carrier screening for recessive genetic conditions in someone who is healthy determines whether the person is a carrier.

A baby receives one copy of each gene from each parent, thus being a “mixture” of genetic information from his/her parents, see figure 1 and 2.

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