Which of the following is an example of a teratogen?

Define the term thecodont.

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.)

Explain in detail how does Swyer syndrome occur? (a person who is typically raised as female and has female external genitalia but also has a Y chromosome).  It has been noticed in the 2016 Olympics, as it was hotly debated.