What is X refering to? What will happen when it binds with II?

The illustration shown is an ovum, a female sex cell. a mutation in this cell may be passed to the woman’s offspring during a) birth. b) mitosis. c) dna replication. d) sexual reproduction

All ova contain sex chromosomes corresponding to: x y xx xy

10. in which phase will crossing-over occur? a. mitosis b. metaphase ii c. prophase i d. meiosis ii