Do Two Recessive Genes Make a Dominant?

Surprisingly yes. I can't think of any examples off the top of my head but it is definitely theoretically possible for a recessive trait to become dominant. ... So one way a trait can go from recessive to dominant is with a new DNA difference that is dominant and causes the same trait.

What happens when you have 2 recessive genes?

Recessive inheritance means both genes in a pair must be abnormal to cause disease. People with only one defective gene in the pair are called carriers. These people are most often not affected with the condition. However, they can pass the abnormal gene to their children.

What happens when both parents have recessive genes?

When both parents are carriers for a recessive disorder, each child has a 1 in 4 (25 percent) chance of inheriting the two changed gene copies. A child who inherits two changed gene copies will be “affected,” meaning the child has the disorder.