How might alterations in dna structure be harmful to an organism?

Changes in the dna are called mutations. They can occur spontaneously. Mutations can only be passed down in gametes--sperm and egg cells. with Darwins theory at mind a mutation needs to pass the test of natural selection to remain in the gene pool. So purposly making mutation or altercations may end in diseases/illnesses or in some cases death because they body can not take ithope this helps if it doesnt im sorry!

It allows water to resist freezing and thawing cycle.