Once this broken gene is present it becomes hereditary. Parents who do have a child with TCS by genetic mutation are very unlikely to have another child with it. Now we know how the genes contained in chromosomes work and determine our characteristics. We can put it all together and see where TCS fits in. This is because the cells passed on when we are conceived are the haploid gametes which contain half the number of chromosomes.
T represents the dominant gene.
This is the gene which causes TCS t represents the recessive gene. Remember the child will obtain one from parent 1 and one from parent 2. One of the gene combinations has a double T gene. I hope this genetics tour has been informative and understandable. Once you have seen all my TCS pages, please take the time to visit my Utilities page where you'll find the guestbook and mailing list.