if i play two dna surgery does it become (say dragon and warrior) do my monsters become dragons and warrios or are they now dragon-warriors or do they cancel each other out...???

As I have stated in another thread...

The 2nd DNA Surgery will "override" the first DNA Surgery...so if you called Dragon for the first one and then called Warrior for the 2nd one, the face-up monster's will be treated as Warrior's until that DNA Surgery leaves the field, then the first DNA Surgery will make them into Dragon's.

You CANNOT have a monster with more than 1 type unless a card effect states so (like Elemental Mistress - Doriado specifically says so in terms of her Attribute).