Ms. Bess plans to peak her sixth-grade students' interest in genetics and heredity by introducing her unit with questions about twins. Which of the following statements is NOT true about twins?
a Identical twins are always the same gender.
b Fraternal twins develop from two separate eggs fertilized by two different sperm.
c Identical twins have the exact same DNA.
d Fraternal twins share more genetic material than siblings who are not twins.
