This means that both parents must carry the recessive gene in order to have an affected offspring.

Both of Katie's parents carried the recessive gene for the disease.

Two recessive genes known as p and v are responsible for this trait.

Kate tried to remember what she'd learned about recessive genes in high school biology, and failed.

"I for one would like to study the possibilities in this recessive gene."

There is a recessive black gene in the breed as well.

Two parts of a recessive gene are required to activate the disease.

It has been suggested that a recessive major gene is involved in this condition.

We needn't worry about recessive genes being brought to dominance.

However, both parents need to carry the recessive gene for any calf to be affected.