Twins are of two types as identical twins as well as non-identical twins! From biological point of view, the identical twins are called monozygotic twins while non-identical twins are dizygotic twins. The identical twins are similar to each other in genetics, but non-identical are different in genetics! The genetics is a very broad subject, which studies the heredity of living organisms within a wider spectrum, and there are many disciplines relating to genetics. The living organisms inherit traits (or characteristics) from their parents, and this process is persistent from generation to generation. The gene, which is a jargon in this field of discipline, is the most important building block to be considered. The proteins produced by genes ultimately determine the whole behaviour of all living organisms.
The gametes or sexual cells of males and females are fused together that is defined as fertilization and ultimately formed a single unit called zygote. The zygote is developed further into a foetus and finally a baby, and due to some different reasons still unknown to science, the zygote could be split into separate divisions at the early stages and each division is developed independently to form separate foetuses. Anyway, the output of this process is monozygotic twins-identical twins! As the same zygote is utilized in this process, the genetic composition of the progeny-the children is kept remained. The dizygotic twins- non-identical twins, some define as fraternal twins, are resulted from different zygotes being developed simultaneously.
In the case of monozygotic twins, the final result may be duplets, triplets or rarely quadruplets! The most important point is that they all are genetically same or in another word, they are like ‘’ clones’’ of the nature! In the plant world, it is easily produced clones by using vegetative propagation means, but in the animal world, animal cloning is facing a lot of practical barriers! And on the other hand, the animal cloning is a moot point in the human world!
In this context, the monozygotic twins-identical twins are considered as “the gift” of the nature! The scientists believe them as ‘’natural laboratories ‘’ because most of them work with scientists on the informed consent to help the human world, especially to find out some secrets in medical world. The service of identical twins is immeasurable! But many people don’t know about it!
Good Luck!
Bimal
Comments