I think an author who writes a book with the major plot line about cloning should at a MINIMUM do a google search on "cloning". Or at least know basic reproductive biology!
The author lost me on page 3 when he erroneously wrote "The best mammoth cells to use for cloning would be an egg from a
female or a sperm cell from a male". Since a sperm or egg would only have half of a DNA compliment where would the other half come from?
Is this science fiction? No it is just fiction. And BAD fiction at that!