Make a chart of their likes and dislikes, colour of hair and eating habits of identical twins
Answers
Answer: in identical twins, there can be minor differences in the appearance of the individuals, but these aren't commonly very pronounced differences. ... Yet, different haircolor is very rare for identical twins as far as the hair color with which they were born. Of course, environment can have an effect on the look of the hair.
Identical twins do indeed start with identical DNA—they are the result of the same sperm from dad and the same egg from mom.
The original fertilized egg divides one or more times before the resulting clump of cells splits into two. Each clump of cells goes on to become one of the identical twins.
In this process of becoming a brand new baby with trillions of cells, the cells in each clump divide over and over again. DNA differences or mutations can happen any time a cell divides.
This is because a cell needs to copy its DNA before it can divide. And while the cellular machinery is astonishingly good at copying DNA, it isn’t perfect. Every now and then it makes a mistake.
All of the new cells that come from the one with the mistake will have that same mistake. One consequence is that if it happens early, the baby will have more cells carrying that mistake.
Think about it like one of those medieval monks patiently copying manuscripts in a monastery somewhere in medieval Europe. Imagine he makes a mistake during copying and the original manuscript is destroyed. Now every new manuscript contains his mistake.