The Mysteries of Human Fertility: On Sex, Fertile Days, and Why the Rabbit Dies
Allen Wilcox MD, PhDNational Institute of Environmental Health Sciences
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What are an average couple’s chances of conceiving in one
menstrual cycle if they stop using any contraception?
What are an average couple’s chances of conceiving in one
menstrual cycle if they stop using any contraception?
25%
What are an average couple’s chances of conceiving in one
menstrual cycle if they stop using any contraception?
25%
In 3 months 50%In 6 months 66%In one year 90%
Female reproductive tract
Ovary
SPERM
How many days in each cycle is a woman fertile?
• Six days:– Five days before ovulation
– The day of ovulation
How many days is a woman fertile?
The perilous journey of the fertilized egg
Fertilized human eggs
DAY 2 DAY 3
A woman needed a kidney transplant. Her adult children were tested as possible donors.
After testing, the doctors told the woman that her children were not really hers.
A woman needed a kidney transplant. Her adult children were tested as possible donors.
After testing, the doctors told the woman that her children were not really hers.
A woman needed a kidney transplant. Her adult children were tested as possible donors.
After testing, the doctors told the woman that her children were not really hers.
Human chimerism.
“ICSI” – intracellular sperm injection
What are the chances that an implanted blastocyst will die in utero?
What are the chances that an implanted blastocyst will die in utero? 33%
Q: What can biology tell us about when a human life begins?
Q&A
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The Nuclear Renaissance
David McNelis, Ph.D.
Director, Center for Sustainable Energy, Environment and Economic Development
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