How do you draw an Illustration of how fertilized eggs develop fraternal triplets?

When a sperm fertilizes an egg, it is then a zygote or fertilized egg. The chromosomes from the nucleus of the egg and sperm form a new nucleus, creating the unique genetic makeup of the new zygote. The zygote then undergoes cell division to form a ball of cells.

Explanation:

c) 50% there are four chromosomes. after crossing over, 2 of the four have been changed. that means any gamete has a 2 in 4 chance or 50% chance of receiving the mutated chromosome.

that is wrong, its not thymus.