Despite significant biomedical advances in recent decades, the very earliest events of human development¬--those that occur during a critical window just after fertilization--have remained an ...

Human bodies have to be built from a single egg cell that's fertilized by a sperm cell. Many rounds of cell division occur as the body is developing, and it seems that there are plenty of chances for ...

The majority of fertilized eggs die and are resorbed into the body. ZEISS Microscopy/Flickr, CC BY-SA As an evolutionary biologist whose career has focused on how embryos develop in a wide variety of ...

The embryos all had chromosomal abnormalities and weren’t meant to lead to a pregnancy. But the results open up questions ...

The technique, still in its early stages, could eventually help people facing age, illness, or same-sex infertility become ...

When couples experience infertility, medical science presents possible solutions for a potentially successful conception of a baby. Infertility issues can be addressed with Human Chorionic ...

A stunning explosion of zinc fireworks occurs when a human egg is activated by a sperm enzyme, and the size of these 'sparks' is a direct measure of the quality of the egg and its ability to develop ...

Multiple genetic changes can occur before or early after conception, a new study describes. The researchers looked at a type of genetic change called copy number variants, which refers to the number ...