Identical twins Jan and Fran were very close sisters. So when Jan died suddenly, Fran moved in to help take care of Jan's daughter (her neice), Millie. Some time later Fran married her brother in law and became Millie's stepmother. When Fran announced that she was pregnant, poor Millie became confused and curious. "So:, Millie asked, "who is this baby? Will she be my twin? Will she be my sister, my stepsister, my cousin?" Can you answer the questions? What is the genetic relationship between Millie and the baby? What processes are involved in the formation of gametes, and how do they affect genetic variation?