Question

some twins look exacly like each other but many do not

Answer 1

Answer:

• Twins are two offspring produced by the same pregnancy.

• Twins can be either:

            Monozygotic ('identical'),  Dizygotic ('non-identical' or 'fraternal')

There are two types of twins, Identical and Fraternal Twins.

• Monozygotic ('identical'), meaning that they develop from one zygote, which splits and forms two embryos. They look alike. The gene composition is same thereby same-gender twins. Only the fingerprints vary from one another.

• Dizygotic ('non-identical' or 'fraternal') means that each twin develops from a separate egg and each egg is fertilized by its own sperm cell. They don't look alike, The gene composition, fingerprints, blood groups vary from one another.

• So, some twins might be of Identical type and some might be of Fraternal or Non-identical type. Thereby, not all twins looks exactly like each other while many do.