Which of the following groups share nearly 100% of their genes?
A) fraternal twins reared together
B) identical twins reared together
C) fraternal twins reared apart
D) a brother and sister born three years apart

Question

Quizplus · Accepted Answer

Identical twins share nearly 100% of their genes as they come from a single fertilized egg that splits into two embryos. Fraternal twins come from two separate eggs fertilized by two separate sperm, so they share about 50% of their genes. A brother and sister born three years apart would share about 50% of their genes like any other siblings. Fraternal twins reared apart would share genetic similarity like any two siblings reared apart, so they would not share nearly 100% of their genes like identical twins reared together.

Which of the Following Groups Share Nearly 100% of Their