Lucky possessors of this trait will be more willing to enjoy new cultures and are less likely to become rundown as a result.
Epistatic gene, in genetics, a gene that determines whether or not a trait will be expressed.
But there's a potentially serious catch: the statistical likelihood of turning up a gene that appears to be linked to a particular trait but ends up having no role in actually causing the trait will be quite high, says Daly.
In instances when two parent organisms each carry two mutant genes in a homozygous recessive state, causing the recessive trait to be expressed, the complementation test can determine whether the recessive trait will be expressed in the next generation.
One trait will be more useful than the other when Elena lands a job as a live-in aide to Cindy and Jim (played by Cindy Silver, the director's mother, and Jim Chiros), dueling spouses who need help caring for Jim's mother.
In terms of evolution, a trait will be selected for if it provides some advantage.
