in the genes

It's not clear what causes PMDD, but it's been linked to being very sensitive to changes in hormones, or certain differences in the genes you inherit from your parents.

So, how can the beneficial traits, encoded in the genes of hybrid plants, be transferred to the next generation?

An estimated 15% of Alzheimer’s patients carry two copies of APOE4, meaning those cases “can be tracked back to a cause and the cause is in the genes,” Fortea said.

“Sometimes we say that we don’t know the cause of Alzheimer’s disease,” but, he said, this would mean that about 15 to 20 percent of cases “can be tracked back to a cause, and the cause is in the genes.”

She and her colleagues sought answers in the genes expressed in the joint tissue samples of these patients.