Question textIf an individual has only one recessive gene for an autosomal recessive disorder they will not be affected by the condition.

That's correct. An individual with only one recessive gene for an autosomal recessive disorder is known as a carrier. They will not show symptoms of the disorder themselves, but they have a 50% chance of passing the recessive gene to their offspring.

Here's a step-by-step explanation:

1. Autosomal recessive disorders are caused by two copies of a gene mutation - one from each parent.

2. If an individual has only one copy of the mutated gene (and one normal gene), they will not have the disorder. This is because the normal gene can do the job of the gene that is mutated.

3. However, this individual is a carrier for the disorder. This means that they can pass the mutated gene to their children.

4. If their partner is also a carrier, each of their children has a 25% chance of inheriting two mutated genes and having the disorder. Each child also has a 50% chance of being a carrier like their parents, and a 25% chance of inheriting two normal genes.

5. If their partner is not a carrier, none of their children will have the disorder, but each child has a 50% chance of being a carrier.