Symbiotic relationships between plant roots and fungi are called a. root nodules. b. tendrils. c. mycorrhizae. d. protists.

"Males who inherit the mutation get the disease because they have no second dystrophin gene to make up for the faulty one. Early in the embryonic development of a female, either the X chromosome from the mother (maternal X) or the one from the father (paternal X) is inactivated in each cell."

(courtesy https://www.mda.org)