Chapter 23, Problem 4IA

Summary Introduction

To explain:

The reason that why twins resulting from a single fertilized secondary oocyte exchange blood or receive organ transplants from each other without rejection, while twins resulting from two fertilized secondary oocytes in some cases cannot.

Introduction:

Twins is defined as the two offspring’s either produces from the same zygote or from two zygotes. The twins which are produced from single zygote are genetically identical and split into two embryos. These twins are known as monozygotic twins. The two embryos forms from the two different zygotes are not genetically identical and are called as fraternal twins.