What is an identical twin?
A. Developed from the same zygote
B. Developed from different zygote
C. Developed from two different sperm
D. Developed from two different ovum

Hint: if a woman gives birth to two babies in the same pregnancy then they are considered twins. The chances of getting twins are 1 in 250 pregnancies. In some rare cases, some women conceive triplets and quadruplets. In these types of cases, it is highly life-threatening to the mother’s life.

Complete step by step answer: Identical twins are also known as monozygotic twins because they are formed from a single fertilized egg which divides into two. Cells divide and multiply at some point very early in the embryonic growth, they split into two individuals. Therefore, the genetic material in these two identical twins is identical to each other. If the twins are developed from two different zygotes then they are called dizygotic twins or non-identical twins or fraternal twins. Dizygotic twins are the result of the fertilization of two different eggs, and thus can be different genders, and look different, and have different characteristics. In fraternal twins only, two different sperms and two different eggs fuse and give two fertilized eggs. Since it has two different eggs and sperms, the identical twins do not form.
Hence, the correct answer is option A.

Note: More than 60 percent of twins, and all higher-order multiples in pregnancy are premature (born before 37 weeks). The higher the number of fetuses in the pregnancy, the greater the risk for early birth. These types of babies are called premature babies. They are born with premature bodies and organ systems. These babies are often small, with low birth weights and they may need help in breathing, eating, fighting infections, etc.