It was nature vs. nurture when the University of Idaho's two mule clones Idaho Gem
and Idaho Star took to the racetrack at Winnemucca, Nevada for the first leg of
mule racing's triple - crown. The mules became the first cloned athletes to
participate in any sport.
The mules were cloned from mule fetal skin cells, so there is no adult animal with
which to compare them. They will provide a unique test of whether genetics or
environment, nature or nurture, is most important.
The mules genetic heritage is from a racing line.

The amount of DNA that each of the cloned mules share with each other is
25%
100%
0%
50%