No.  Iowa does not recognize a will simply because it may be shown to be in the handwriting of the alleged creator of the will.  In order for a will to be valid in Iowa it must be type written and signed by the person wishing to execute the will (who in Iowa is called the Testator).  In addition the will must also be signed by at least two witnesses.  These witnesses must not be permitted by the will to receive any money or property and the witnesses must be at least 16 years old to be recognized as a legitimate witness.