Question

In humans, twins that develop from two fertilized ova are

• A. Always of the same sex.
• B. of the same or different sexes but are very similar, if not identical in appearance.
• C. of the same or different sexes and as similar to each other as regular siblings.
• D. always of same sexes.

Answer 1

The correct option is C

of the same or different sexes and as similar to each other as regular siblings.

Twins are two offspring produced by the same pregnancy. Twins can either be monozygotic (identical), meaning that they can develop from just one zygote that will then split and form two embryos, or dizygotic (fraternal), meaning that they can develop from two different eggs, each one fertilized by separate sperm cell. Twins that develop from two fertilized ova are of the same or different sexes and as similar to each other as regular siblings.