If it was down to the nurture factor alone Jones' baby to Montgomery
would certainly become a world sprint champion.But where nature plays the dominant hand, it's a roll of the genetic dice. Dr Jenny Donald, lecturer in human genetics at Macquarie University, said it did not automatically follow that the world's fastest couple would breed a
super athlete. "Undoubtedly there will be genes that affect sporting ability, just like there are genes that affect height," Dr Donald said.
"But we don't know all the genes in height which is something nice and
straight forward and easy to measure, let alone something like sporting ability where it's going to be all sorts of different factors. "You can't expect that their child will be a world record-holder, too. There are just too many different factors."