Department of Energy Argonne National Laboratory Office of Science NEWTON's Homepage NEWTON's Homepage
NEWTON, Ask A Scientist!
NEWTON Home Page NEWTON Teachers Visit Our Archives Ask A Question How To Ask A Question Question of the Week Our Expert Scientists Volunteer at NEWTON! Frequently Asked Questions Referencing NEWTON About NEWTON About Ask A Scientist Education At Argonne Egg Fusion
Name: David P.
Status: Educator
Age: 40s
Location: N/A
Country: N/A
Date: May 2004

Although well out of the realm of my topic areas (mathematics and computer applications), one of my students asked if I had heard of two human eggs fertilizing each other. He claims that it is a rare but possible phenomenon. Is such an occurrence possible? If so, where can I learn more on this topic.

Were your students perhaps watching the season finale of CSI??? They dealt with a rapist who kept escaping prosecution because his semen DNA type did not match his blood DNA type. Of course, he was caught in the end! I believe your students are referring to the rare occurrence of human chimeras. They are actually the result of 2 embryos fusing into one, instead of two eggs fusing. More info can be found at this link:


Click here to return to the Molecular Biology Archives

NEWTON is an electronic community for Science, Math, and Computer Science K-12 Educators, sponsored and operated by Argonne National Laboratory's Educational Programs, Andrew Skipor, Ph.D., Head of Educational Programs.

For assistance with NEWTON contact a System Operator (, or at Argonne's Educational Programs

Educational Programs
Building 360
9700 S. Cass Ave.
Argonne, Illinois
60439-4845, USA
Update: June 2012
Weclome To Newton

Argonne National Laboratory