David and Katie have always been close. In fact, they are so close that they shared the womb when their mother was pregnant with them. Given the information that you have already been given in this question, which of the following can you state conclusively?
A) David and Katie are monozygotic twins.
B) David and Katie are conjoined twins.
C) David and Katie are dizygotic twins.
D) David and Katie share 25% of their genotype.

Question

David and Katie have always been close. In fact, they are so close that they shared the womb when their mother was pregnant with them. Given the information that you have already been given in this question, which of the following can you state conclusively?
A) ​David and Katie are monozygotic twins.
B) ​David and Katie are conjoined twins.
C) ​David and Katie are dizygotic twins.
D) ​David and Katie share 25% of their genotype.

Quizplus · Accepted Answer

David and Katie being twins is evident from the context of sharing the womb simultaneously, but the fact that they are of different genders (David being a male name and Katie being a female name) conclusively indicates they are dizygotic (fraternal) twins, as monozygotic (identical) twins would be of the same gender.

David and Katie Have Always Been Close