Spiders are dominant. If you bred a Spider male to your normal female each egg woul dhave a 50% chance of being a Spider and a 50% chance of being normal.
If you bred a Axanthic male to your normal female each egg would look normal and would be het Ananthic. If you took a baby het Axanthic female from that clutch and bred it back to the Axantic male each egg would have a 50% chance of coming out Axanthic and 50% chance of being a het Axanthic.