Philosopher David Papineau on whether the chicken or the egg came first:
Professor John Brookfield, a specialist in evolutionary genetics at the University of Nottingham, told the UK Press Association the pecking order was clear.
The living organism inside the eggshell would have had the same DNA as the chicken it would develop into, he said.
"Therefore, the first living thing which we could say unequivocally was a member of the species would be this first egg," he added. "So, I would conclude that the egg came first."
The same conclusion was reached by his fellow "eggsperts" Professor David Papineau, of King’s College London, and poultry farmer Charles Bourns.
Mr Papineau, an expert in the philosophy of science, agreed that the first chicken came from an egg and that proves there were chicken eggs before chickens.
He told PA people were mistaken if they argued that the mutant egg belonged to the "non-chicken" bird parents.
"I would argue it is a chicken egg if it has a chicken in it," he said.
"If a kangaroo laid an egg from which an ostrich hatched, that would surely be an ostrich egg, not a kangaroo egg."