Â· 4 years ago. A mutation is a change in the genetic material of an organism. We are made from trillions of cells, each with a nucleus composed of DNA â a set of instructions that tells the cell what to do. Cells copy themselves with astonishing accuracy, but every now and then a piece of code is copied incorrectly.
Identical (or monozygotic) twins happen when a fertilized egg splits into two separate babies-usually within the first twelve days of Mom's pregnancy. After twelve days, the egg may not split entirely and result in conjoined twins.
Report Abuse. Eggs usually survive 12-24 hours after release. However, sometimes another egg is released within 24 hours of the first egg (how you get fraternal twins), which means you could still get pregnant 48 hours after ovulation. Its possible that's what happened-the timing for the spotting looks good.owever, sometimes another egg is released within 24 hours of the first egg (how you get fraternal twins), which means you could still get pregnant 48 hours after ovulation.