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.
If the yolk is breaking easily then the eggs are either older eggs or lower grade eggs. The highest grade eggs is AA which not only looks at shell quality, but also the yolk quality. AA eggs should have a tall firm yolk. Over time the yolk becomes less firm and resilient causing breaking when it's cracked.