Which is true of twins?
A) Monozygotic twins always share a genotype but may have different phenotypes.
B) Dizygotic twins always share a genotype but may have different phenotypes.
C) Monozygotic twins always share a phenotype but may have different genotypes.
D) Dizygotic twins always share a phenotype but may have different genotypes.

Question

Quizplus · Accepted Answer

Monozygotic twins are identical twins that are formed from a single fertilized egg that splits into two embryos, therefore they share the same genotype. However, they may experience different environmental influences which can result in differences in their phenotype (observable characteristics). Dizygotic twins, on the other hand, are formed from two separate eggs fertilized by two separate sperm and therefore share on average 50% of their genes, making them no more genetically alike than non-twin siblings.

Which Is True of Twins