Which of the following statements most accurately describes monozygotic and dizygotic twins?
A) Monozygotic twins have exactly the same genotype and phenotype, whereas dizygotic twins do not.
B) Monozygotic twins have exactly the same chromosomes and genes, whereas dizygotic twins have exactly the same genes but different chromosomes.
C) Monozygotic twins begin as the same zygote, whereas dizygotic twins begin as two separate zygotes.
D) Dizygotic twins are less similar genetically than monozygotic twins, but more similar genetically than regular siblings.
Answer: C