It never occurs, direct blood and nerve connections between the mother and the embryo never occur.
An embryo shares half of the genetic pattern of the mother. HOWEVER- you said HOST mother. In the case of a fertilized egg implanted in a mother that did NOT donate the egg, then there is no genetic relation between embryo and host mother.
Placenta
Because of the difference of the blood type between the mother and child.
The placenta is where the material between mother and child, like nutrients and oxygen, travel from one to another.
umbilical cord, which is linked with Uterus with Placenta... Mukul Jain
An embryo shares half of the genetic pattern of the mother. HOWEVER- you said HOST mother. In the case of a fertilized egg implanted in a mother that did NOT donate the egg, then there is no genetic relation between embryo and host mother.
The highly vascular structure that acts as a communication between the mother and the embryo is called the placenta.
The chorion is the outer membrane surrounding the embryo that is continuous with the placenta, the highly vascular structure that acts as a physical communication between the mother and the embryo.
placenta which is between the mother and the embryo.
placenta
Placenta
The placenta.
The chorion is the outer membrane surrounding the embryo that is continuous with the placenta, the highly vascular structure that acts as a physical communication between the mother and the embryo.
i don't know! i guuse mida!
Because of the difference of the blood type between the mother and child.
The placenta is where the material between mother and child, like nutrients and oxygen, travel from one to another.
The Placenta. Source: Wiki Answers lol