Bill and his sister Ann are twins;however,they cannot be

Question

Quizplus · Accepted Answer

Monozygotic twins, or identical twins, come from a single fertilized egg that splits into two embryos. This means that they have the same genetic material and are always of the same sex. Dizygotic twins, or fraternal twins, come from two separate eggs that are fertilized by two different sperm, resulting in two embryos that may be of different sexes and have different genetic material. While Bill and Ann are both twins, the fact that they are different sexes means that they cannot be monozygotic twins. They also cannot be told apart based on this information alone, so option D is not correct. Therefore, the best answer is A) monozygotic twins.

Bill and His Sister Ann Are Twins;however,they Cannot Be