Crossing over or Chromosomal crossover is the process that
occurs in cells between the stages of phrophase I and metaphase I in meiosis. It is important
because it is responsible in the exchange of genetic material between
homologous chromosomes during sexual reproduction. This process ensures the
normal segregation of chromosomes during meiosis, and genetic variation.
Homologous chromosomes pair up with each other and exchanges segments of their
genetic material to form new chromosomes. Thomas Hunt Morgan described crossing
over in his theory of genetics.
