Can a female parent pass a X-Linked Trait to a XY offspring?

A human child is born with hemophilia (a condition in which the blood does not clot).  Neither parent has hemophilia, and the gene whose (recessive) allele causes hemophilia resides on the X chromosome. What are the genotypes of the parents?  (No explanations are needed.)

What is chromosome theory of inheritence?

Hemophilia, disease in which the blood lacks a clotting factor, is caused by an X linked recessive gene. Joe doe not have hemophilia and Lucille is heterozygous for the condition.  What is the chance that their MALE child will have hemophilia? (Note: you are calculating the probability for their MALE children only, in other words if they have 1 male child, what is the probability that he will be born with the disease?)     0%     1/4 or 25%     2/4 or 50%     3/4 or 75%     4/4 or 100%

How could you distinguish between an autosomal recessive trait with higher penetrance in males and an X-linked recessive trait?

What are X-linked traits?

When is the only time crossing over can occur?