Hemophilia is carried on the X chromosome. If it is passed on to a son it came from its mother. If a daughter inherits it it could have came from either parents or even both. If from the father he himself would have been a hemophiliac. Hope this helps.
Answer:
Changes can occur to physical properties of a substance, but the chemical composition of the substance remains the same.
Absolute dating uses the half-life of an element.
