Which Statement About the X Chromosome Is True

Multiple Choice

Which statement about the X chromosome is true?

A) Most of the X chromosome genes encode proteins that have no role in female sexual development.
B) Heterozygous females are more severely affected by X-linked-dominant disorders than heterozygous males.
C) When dominant alleles are present on the X chromosome, they are expressed in a recessive manner in the hemizygous state.
D) When males have the unusual condition of two Y chromosomes and are missing the X chromosome, all physiologic function remains normal.